Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ac4a476440913c…

MALICIOUS

PDF

94.4 KB Created: 2021-03-28 08:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2c61486c34659c3e2ff9c005fce16669 SHA-1: 11c96808172219d7397e49feec6fa080b3bdd96a SHA-256: d4ac4a476440913c202e2c55ba05f0a2f2cdec195e178f7e7783fa1aab7920fa
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 0.9992

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=ing+package%2527+omnisharp+for+windows+error PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5fdacda1da879.pdfIn PDF document text
    • http://phulop.store/kp_astrology_books_banglan5q42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5ff163ff60c0b.pdfIn PDF document text
    • http://fasad-dom.site/xijikudyjjc.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/c8ozQGh/small_white_chicken_with_feathers_on_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/nfQNhd1/bagimul.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/dzgehbv/23126406283.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/hijCiiF/bsaci_guidelines_rhinosinusitis.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/tasoxezepojemu.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/iajvhdM/can_you_get_the_chosen_app_on_roku.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/bhaBi6T/93440978063.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/what_does_it_mean_to_be_filled_with_the_knowledge_of_gods_will.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5fe0834126520.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/matotelutedogekawofa.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/cS0qhbe/35062011907.pdfIn PDF document text
    • http://hookup755.fun/linkedin_jobs_chicagoegg00.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/iioig2h/60203658200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6023dd2f44c32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee76a38d-a74f-4fcf-9833-d0e84f0acac8/13475327041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c67d2cc-f347-4b9b-94fa-8e1fb4479c48/is_there_free_will_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf56b9c2-0acf-4c3c-9088-191581f5edf2/how_to_turn_on_a_fake_fireplace.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/mono_ethylene_glycol_msds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ba9b0a-0026-4d09-85ad-8918287945da/55352561886.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/the_lost_ways_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d3c364-a45e-44f0-9ae7-61902052cfcc/jepuxapitekugijutijab.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_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 5664 bytes
SHA-256: aa320b4a7227f12c3a2b049a1c82ea5ee6442a99732a4763a792efa258c0b555
font_01_sfnt_off000137c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 19936 bytes
SHA-256: b8f80fb858cf3006a1dd5614c56e0ca2d2f5284c67cac6836b508ace6a33b8be

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