Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6703aa390e3bae9…

MALICIOUS

PDF

143.0 KB Created: 2020-11-10 07:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65bb74e3755dafea509f18a7024ea96 SHA-1: d720cd42d9554acc9fa6bdb21a84f1c25ec653ff SHA-256: a6703aa390e3bae951f84583c9e6705792a0440ff575f6d5a1612056542b6f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to sensitive search terms, likely intended to attract user attention. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://trafffi.ru/aws?keyword=selena+quintanilla+autopsy+photos
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/xexakivepixona-pajof-davewuza-sasetoj.pdf
    • https://nupirunu.weebly.com/uploads/1/3/4/2/134265900/porik-xegefuxiri.pdf
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/7775054.pdf
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/sevanoruti_rufurefofax_ponuwunedimebe.pdf
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/mimegubofiwo.pdf
    • https://dovogejeromew.weebly.com/uploads/1/3/4/6/134666082/6f6f668b64591.pdf
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/5657021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c634fecb-7dd0-4c77-ad5c-92141c799f71/95509907441.pdf
    • https://s3.amazonaws.com/wegemebufojafak/vokenewemutatok.pdf
    • https://uploads.strikinglycdn.com/files/49b8bf28-246e-4e0c-9c9c-a65c7d06ec64/fijutotavutanowe.pdf
    • https://uploads.strikinglycdn.com/files/0bc4c6e1-56eb-42d8-8dd6-4c0b8168632a/gatazalexejemifafur.pdf
    • https://s3.amazonaws.com/somamere/40511711503.pdf
    • https://uploads.strikinglycdn.com/files/ed6b6d96-f973-4bf3-9f31-22fb148276a2/zalegipixobemadarukekig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f307.bin
1475f5d33c765974c1b030d8ce897fcf3aabccce1b0c8f4eb3453a3097a2783b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F307 5140 bytes
font_01_sfnt_off0002048a.bin
0bd46533a380560396dda80bf4e63ba440d427c0ff9e8f08ea9324d1f5b50313
pdf-font-stream PDF embedded font (sfnt) at offset 0x2048A 13052 bytes