Malicious PDF — malware analysis report

Static analysis result for SHA-256 91199f5d583c6c9a…

MALICIOUS

PDF

75.4 KB Created: 2021-04-08 09:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af9a0b9c66397c7f07628e69ab362c85 SHA-1: d39ec50236283f179894d4663731fb74ca41a2cd SHA-256: 91199f5d583c6c9a2288e537e8ddde02a6b2d4448fb477ba15310122270eea3d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with one notable URL pointing to a domain associated with link farming and disposable hosting, suggesting a lure to malicious content. Although the document body is heavily obfuscated, the presence of external links and the overall detection profile strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=algebra+2+solve+each+equation+worksheet PDF link annotation
    • http://mezilefet.iblogger.org/panasonic_toughbook_cf-54_battery_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/gfLigha/66014798774.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/gl4gcic/smash_hit_unlimited_balls_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/hdjfbxG/bold_font_in_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/jegc01s/37502165214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd1ab86ad6fd.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/gcIijoV/37816637474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_6047fce7eb945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fcd40b982283.pdfIn PDF document text
    • http://nupokupukog.22web.org/23198265159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485450/normal_6008adfcc1879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffd05a25dad0.pdfIn PDF document text
    • http://mozodulo.iblogger.org/world_countries_and_capitals_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_7990bd70d62547fc94eaec6dd9ec19da.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_53872a9ac14b4d219aaf0b65aa2abde2.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_09b8bc1e90b94c59a68f0fbfec86b483.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_c7102360637541679c53834a6ac24193.pdf?index=trueIn PDF document text
    • http://dutinafojev.epizy.com/dadatajaxagoga.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/ravolezupenarodukeweninam.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/66046095141.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/logitech_x_540_price.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/persepolis_pelicula_completa_subtitulada.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 5664 bytes
SHA-256: cd970335d47a4c035a135b6ba3ac69d7c3e28fe09c281cfcee042c9859d05ab3
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 10484 bytes
SHA-256: b02f99214b43d5e6bbe448e74124a356aff8f8ad88f0ce5b0be69667cf00f842

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