Malicious PDF — malware analysis report

Static analysis result for SHA-256 de36b779f4da9c29…

MALICIOUS

PDF

75.6 KB Created: 2021-01-31 21:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34fd732e769c4ca0615d5d729466f39c SHA-1: 31cc911dfcbd98cb1816faed26cd0d03f482000e SHA-256: de36b779f4da9c2973a30b6437e201d32514c22dec6a4bf510fa2611314f2588
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=lutheran+church+of+the+reformation+capitol+hill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470981/normal_601602d44272a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ffa5b560fe8b.pdfIn PDF document text
    • http://intereriia.com/baldi_s_basics_easy_mod_apkr6dkb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497075/normal_5ff9cf3182921.pdfIn PDF document text
    • http://japadalifu.22web.org/blackshot_for_macbook.pdfIn PDF document text
    • http://francobusiness.com/sulipugdqbv.pdfIn PDF document text
    • http://namelesssouth.xyz/duxetidimonubub0og1y.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/64048472253.pdfIn PDF document text
    • http://maslovauto.ru/easy_native_american_flute_sheet_musro21l.pdfIn PDF document text
    • http://good-production17.site/fegubimodegiteronikuzecqan0.pdfIn PDF document text
    • http://stnold.com/area_de_figuras_planas_exercicios_9_anoxrfhh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikididubemet.epizy.com/manual_lawn_aerator_lowes_canada.pdfIn PDF document text
    • http://jufosuliz.epizy.com/97822523563.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/secondary_school_report_form_common_app.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/mofesu.pdfIn PDF document text
    • http://kixomeremit.epizy.com/88486595200.pdfIn PDF document text
    • http://mogadaf.epizy.com/vutedoxul.pdfIn PDF document text
    • http://kajoxuf.epizy.com/razovisipevoxuzoribipevas.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/barbie_bike_stylin_ride_game.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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5020 bytes
SHA-256: 6137707a881ea73d46465a8928128d3b759d1af72e7472dd99d111b69057fb1a
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11340 bytes
SHA-256: b027e3de30bcbe4c5fb4f88899b6194b11b9408e8d3875c4209a67df367d1614