Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1d8fff9eb1cc7e…

MALICIOUS

PDF

73.8 KB Created: 2021-04-01 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 453c9b641d1f435b8405eea33a21ea1b SHA-1: cb880ede3cb511970bb49668b6fca70bf5a8e1e2 SHA-256: 8c1d8fff9eb1cc7ee46f4c8951e9b0107d2c804a8deaf6a415a7dad606a9a33d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=2012+chevy+malibu+service+manual PDF link annotation
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/9dc24211078902.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/ibqNaia/xudizov.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/hExiiIj/revheadz_engine_sounds_full_apk_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wupefukawis/4iclhgL/nirek.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/molexopedemamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fffde2fbf011.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/jh93Yih/bekekusidok.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/khj5vja/spacex_crew_dragon_mission.pdfIn PDF document text
    • https://cdn.sqhk.co/zawileveruz/jcgighi/water_slide_nail_decals_for_sale.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/didubinebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_60111f615baff.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/gcggggV/lejukiz.pdfIn PDF document text
    • https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/sekunizoxafesixut.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/hdCkgff/datobaripew.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/wanemir_lovejibeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/vagofixipa.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/psp_game_god_of_war_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/23992915766.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/99563037002.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 5572 bytes
SHA-256: 3796cd02409b8084deb7933b3cdd918f8e4904522a8a580a598c3c6108ab6e62
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10276 bytes
SHA-256: d5f8b7bc201bbecc7ae4b367b07730025325c52cc19f45076846a5ef76d52fe9

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