Malicious PDF — malware analysis report

Static analysis result for SHA-256 723ad3ce0cc74c96…

MALICIOUS

PDF

67.9 KB Created: 2021-02-12 22:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccb78bd76b8274473fa1134159dfeaac SHA-1: 1b04291997756543fed09dcd3f9537ca64ffd84b SHA-256: 723ad3ce0cc74c964ca45c8d711ab57fcbcb17d9c4bbe01f76a5784be79425e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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/wix?keyword=frawley+stadium+covid+19 PDF link annotation
    • http://lifeeuro.info/85697928912gwe9s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_600de3c714dca.pdfIn PDF document text
    • http://milanomoda-italy.website/bhop_godlike_59cvy0.pdfIn PDF document text
    • http://espaceabonnes.com/78447772629irbbz.pdfIn PDF document text
    • http://runmasten.online/banjaran_movie_ke_video_songnawwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd646418dd6b.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/OhdjbUS/modern_drone_air_strike_battle_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05a86a5e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_5fe70b585e098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fimaxopazeviv.rf.gd/5376550962.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/guredemixivafu.pdfIn PDF document text
    • http://dupodege.rf.gd/sigamabu.pdfIn PDF document text
    • http://fobukisa.rf.gd/wuzumudolezodekenizepotu.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/qaseeda_e_burda.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_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 5504 bytes
SHA-256: 126776bf9b121c91b8cdd133936a2f7dba73e15b08287aa36fc0a9ad82ebda1e
font_01_sfnt_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 10288 bytes
SHA-256: 0444daeb9dbf084f9c6262e08ee1d58001973e67e88cd89dea5c1353f9dd6ed2

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