Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dd61e1b1a56f0e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 08:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: be3361b80f2d857ef1009c31b0a8983b SHA-1: e94ddf59b42ad1236468294ee118afa2e84daa6d SHA-256: f5dd61e1b1a56f0e2f8d02592a299f91f119df8e8a65a6c125902375ad773f8a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of 'cmd.pdf' and external URLs in the document text, along with the PDF_SEO_LINK_FARM heuristic, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=honors+geometry+final+exam+review+packet PDF link annotation
    • https://cdn.sqhk.co/nebafori/xjegcgI/android_google_maps_directions_intent.pdfIn PDF document text
    • http://jakor.pro/lurinifom9u1.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/mepetiruzi/SnzJxrc/cyclebar_garden_city_groupon.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/guvevifowo/Riihh9r/defender_2020_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/hcgW7ja/11144614957.pdfIn PDF document text
    • http://malitaludim.iblogger.org/43236990059.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/ggiePKd/little_alchemy_2_unblocked.pdfIn PDF document text
    • http://just-gopro.com/8577477299ku90f.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/6gfAhb8/77037892078.pdfIn PDF document text
    • http://tpdreport.com/how_to_thread_an_old_dressmaker_sewing_machineqon14.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/jozalikijetaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werujutiweponig.rf.gd/mavapirivakuxozolulujabej.pdfIn PDF document text
    • http://rimamosapike.epizy.com/anorexia_2020.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_ddad44488dbb4a9bb9d3f9294b287a78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cbab4b-55f5-4eab-814b-4795169cce11/how_to_list_the_files_in_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f0bb3b-a327-4b57-8d02-8bd18c280453/42037644800.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_90753a595f3a42739344344df05d7ebb.pdf?index=trueIn PDF document text
    • http://lexulegoserixa.epizy.com/1996_four_winds_travel_trailer_owners_manual.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_76f13b8dbe494896839434a18e801f65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05530704-7e9a-4358-b2b5-bf0cd4da8bb9/28999577557.pdfIn 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
    • https://uploads.strikinglycdn.com/files/99f0bb3b-a32In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5684 bytes
SHA-256: 42f5f376800a95d27ded9e7bc5830a20ab5754bdf7be9ed8c5b1d6ac6209b825
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 11024 bytes
SHA-256: 52c5a53d7e308d56ec40265ccec80c37fda4277f2843ae881d41446df56cd9b4

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