Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b62908af7166b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-11 09:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43cd0d5bd8df0276bf0af77fdeaca077 SHA-1: 2292f12c80ef9549ebeac2b0b204a138e7d22f57 SHA-256: 743b62908af7166b7336c82e1c964995f3f18214e08b121dfea7692bf6342dc9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically related to phishing. While no scripts were extracted, the primary attack pattern involves directing users to potentially malicious external sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/strik?utm_term=how+much+are+muffins+at+dunkin+donuts PDF link annotation
    • http://top-shop-store.website/52519221275j6ldu.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/GZhjk0F/geligigevoligivotagizoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_6034f2011c607.pdfIn PDF document text
    • http://fastcreditreport.info/23414699127kl5ce.pdfIn PDF document text
    • http://busivel.xyz/fawijasejifa7gs38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_602a98e0eea28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367959/normal_5fe39068e1ca6.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/ijfTU2u/2072538966.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/7nppje8/tukusa.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/mNTGoUL/bseh_aarohi_school_answer_key_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60179f28e70d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_600fd1a36e3b4.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/UWWHsyr/91987714608.pdfIn PDF document text
    • https://cdn.sqhk.co/roziguze/8ha7hiV/xonitalobara.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/5418ad4d-f850-473a-9edf-a7e46ae13292/would_you_rather_holiday_questions_adults.pdfIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_80ec1a44b2eb46d0a41892eec55e568e.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_035d3c3f4c87402083b0b351f4d87725.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34aea012-7476-42e1-adaa-f1a93796707f/noxomob.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5348 bytes
SHA-256: f4c6827d93e241d6ac412725a65fc927b7d7e83b8f3ae8d3d5c543417ac87979
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 11516 bytes
SHA-256: 1ce2ac146d9d45d3f6fe535a4cd746c96dcefefd7ca2f538efb6f2c23a4320a8

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