Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb3676b6e93e88d…

MALICIOUS

PDF

76.9 KB Created: 2021-05-11 04:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39af79728a160d283a4f26f7597a2e6b SHA-1: 167a0268f4a619aa2751eb26bbb470deae042576 SHA-256: acb3676b6e93e88de91c6faee8aebd9c8e1da4ffc174dafa4700b738f0eb3483
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-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://fokemale.ru/strik?utm_term=how+to+ignore+friends+on+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385010/normal_6023dddcd9b53.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/xadigizobokunezozazoxera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_6059cc23ef76d.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxonukifi/3jjchfS/23405260169.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/aiaicie/tugozufusotexabuwado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_5fd3ddbdc1fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_600fd0f4d4ebc.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/ashrae_2020_hvac_systems_and_equipment_handbook.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/sufezatekuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_6023bddfb6816.pdfIn PDF document text
    • http://tipepusevuw.iblogger.org/nomesowiza.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/8LDVrV2/radiant_cut_three_stone_diamond_engagement_rings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5ff25d6d20dc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fefd443b4316.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/fire_safety_risk_assessment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxosutemow.onlinewebshop.net/rifibivobunozaguvajut.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/banking_services_chronicle_july_2020.pdfIn PDF document text
    • http://xumeweb.rf.gd/80348955506.pdfIn PDF document text
    • http://tadidemoribezor.epizy.com/free_business_english_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 5416 bytes
SHA-256: 3cd007c4a070c1b02c0ed463887f4b0c4ed9da4ea1f773804b82a83dab81ed22
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 11168 bytes
SHA-256: 810ae604dadef4aaadf3dbbb13289a06859a3863f5ffa18ce47a9452236405db

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