Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf4b766e61acf1e…

MALICIOUS

PDF

40.2 KB Created: 2020-04-21 02:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: b5ca0a8e243579351914159d09635498 SHA-1: fe5a70a79432a1ca62ea7f015c7d3bdbdb241685 SHA-256: ebf4b766e61acf1e0989f5c29ea18307328195cc933da927426c0c710b75320a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to 'sheet music' and the wkhtmltopdf application, suggesting a lure. The presence of a 'Visible LOLBin command execution instruction' heuristic firing suggests that the document may also attempt to execute commands, potentially to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thesoonernetwork.com/uploads/1/3/1/6/131636969/131636969.html#kiss+of+fire+hugh+laurie+sheet+music PDF link annotation
    • http://actioneleven.com/uploads/1/3/0/4/130483478/pomekamaw_kawebovutasolir_wugatemifuran_vevagomexi.pdfIn PDF document text
    • http://sewdivinecreations.com/uploads/1/3/1/4/131454383/08be88b.pdfIn PDF document text
    • http://goody2.net/uploads/1/3/0/6/130640052/5431a9aaa.pdfIn PDF document text
    • http://unclebiffscaliforniakillercookies.com/uploads/1/3/0/6/130605432/wonovipikavifo.pdfIn PDF document text
    • http://antonioduarte.org/uploads/1/3/0/5/130551218/doneja-mudupunutiviw.pdfIn PDF document text
    • http://xteraweb.com/uploads/1/3/0/4/130483537/bb03ee17dd8e83.pdfIn PDF document text
    • http://driso-music.com/uploads/1/3/0/2/130272940/lapiperivufe-gurepifisus-fimarix-kukojupuxanes.pdfIn PDF document text
    • http://thedubdesigners.com/uploads/1/3/0/4/130488312/pikowadijapage.pdfIn PDF document text
    • http://yogaandwellnesswithbetsyjodi.com/uploads/1/3/1/3/131381150/a23ab3878b3a58d.pdfIn PDF document text
    • http://windowscleanersyork.com/uploads/1/3/0/5/130589312/7533433.pdfIn PDF document text
    • http://acehighcheerandgym.net/uploads/1/3/0/3/130323139/9030553.pdfIn PDF document text
    • http://betterthanbadgamers.com/uploads/1/3/1/3/131379035/gudivobaxebuzel_pusadaru_nenolevebudovis.pdfIn PDF document text
    • http://americanfamilygeriatriccare.com/uploads/1/3/0/9/130969301/mumawafewozupew_fadigivetu_romupubuze.pdfIn PDF document text
    • https://musescore.1In PDF document text
    • https://musescore.jpg?cache=0In PDF document text
    • https://musescore.0In PDF document text
    • https://musescore.png?no-cache=1575932381In PDF document text
    • https://musescore.040000000000000000832667268468867405317723751068115234375In PDF document text
    • https://nocdn.netIn PDF document text
    • https://musescore.png@300x420?no-cache=1575932381&bgclr=ffffffIn PDF document text
    • https://musescore.openx.png@180x252?no-In PDF document text
    • https://musescore.05000000000000000277555756156289135105907917022705078125},{In PDF document text
    • https://musescore.netIn PDF document text
    • https://musescore.jsonp?revision=1575932359&no-cache=1587426073In PDF document text
    • https://musescore.01000000000000000020816681711721685132943093776702880859375In PDF document text
    • https://musescore.mp3?revision=1575932359&no-cache=1587426073In PDF document text
    • https://musescore.com%2Fuser%2F32488218%2Fscores%2F5883835In PDF document text
    • https://musescore.ultimate-guitarIn PDF document text
    • https://musescore.com/user/32488218/scores/5883835In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/5/3/8/5883835/ec512e70fdd414e459f7d175aca162d50471703d/score_0.com/ug/In PDF document text
    • https://musescore.com/static/musescore/scoredataIn macro / runtime command snippet
    • https://musescore.com/score/stats/delayed-view?score_id=5883835In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/5/3/8/5883835/ec512e70fdd414e459f7d175aca162d50471703d/score.com/static/public/img/musescore/piano_rollIn PDF document text
    • https://musescore.com/user/32488218In PDF document text
    • https://musescore.musescore.com/static/musescore/userdata/cover/f/b/b/32488218.com/user/21585386\rSupportIn PDF document text
    • https://www.com/static/musescore/scoredata/gen/5/3/8/5883835/ec512e70fdd414e459f7d175aca162d50471703d/In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/5/3/8/5883835/ec512e70fdd414e459f7d175aca162d50471703d/score.youtube.com/user/21585386/scores/5634470/piano-tutorial?from=youtube_shareIn PDF document text
    • https://musescore.com/score/stats/view?score_id=5883835In PDF document text
    • https://musescore.com/watch?v=L-42iZef7y4In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/5/3/8/5883835/ec512e70fdd414e459f7d175aca162d50471703d/score.com%2Fuser%2F32488218%2Fscores%2F5883835In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7388 9216 bytes
SHA-256: 78a34b1e1dfe6f0425cfb95ab0589ba3a331e4bf4a1d98125b4544109df51b1f

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