Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9db0dfa7d1780a4…

MALICIOUS

PDF

169.0 KB Created: 2021-03-27 20:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 73b09e4c189fbf0c97b08d7d1ddc0d83 SHA-1: a405d899723986245cab44bdb95f766ce39a9920 SHA-256: a9db0dfa7d1780a4d33dbf805e3a2036697b79626a635966f24a01b5051cdfbb
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The 'SE_MFA_LURE' heuristic indicates the document's content is designed to trick users into providing sensitive information, likely related to credential harvesting or MFA abuse. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pelibifir.ru/wix?keyword=video+game+quiz+answers+level+13+android PDF link annotation
    • http://mesanezedid.mypressonline.com/21774235981.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/gj5CVgi/bigbang_glitch_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jjggtgg/kejawifepaw.pdfIn PDF document text
    • http://mastericy-chistoty.ru/asus_armoury_crate_service46lmn.pdfIn PDF document text
    • http://bestrongbyg.com/english_grammar_books_online_purchaseyuvgs.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/business_unit_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/jjiBwRA/lunijuwaxodunofu.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/fja6jdm/sijatusejixolaredubu.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/gojoramijowemupazaxowojud.pdfIn PDF document text
    • https://cdn.sqhk.co/lojewewure/jiiay8s/68449346437.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/bitcoin_trading_strategies.pdfIn PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/475e34e014b.pdfIn PDF document text
    • http://healthyforczechrepublic.site/kabhi_alvida_naa_kehna_movie_freebrp3x.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/pegududabip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_dcf91108d18f4cda81ac4bbea66f648e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c83bea-9262-4f69-ba95-10801bc5d4f3/bagiwisukapes.pdfIn PDF document text
    • http://jimarol.myartsonline.com/56568383306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06ef1c3-060b-48c9-8980-cd07857aa1a7/big_data_analytics_in_bioinformatics_and_healthcare.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_b128d11afdb74b52bc9526a64d676eed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e033993-78c7-454a-a91d-257839f1ca9e/50138360558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1473ee5b-13d2-4112-9e7e-4ab8b76bcd87/one_thousand_and_one_nights_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6e4688-df0b-44e8-acc3-18624a2633ff/how_and_when_to_review_the_written_health_and_safety_policy_statement.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_a65121ad436c434cb3c2a69ec44236c8.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_8b38978b8d364fecbf5c6a46ed1db8ff.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_5f9e28845cae4d7980dd41c1a5468316.pdf?index=trueIn 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_off00025a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A5A 5652 bytes
SHA-256: 24ed4d8f044c569c13a4fd94d37b1400da092a233858ebb38db887e8a1f5da6a
font_01_sfnt_off00026da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DA4 11868 bytes
SHA-256: ff1adfef6f7c4af4013d1217a063f578dc5cfa485fffcd387339d574b51179ae

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