Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fa002514ffc30c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 22:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d02ddf0b3fa786a100182d6bdc6e208 SHA-1: 5b41706eece46e27392d81b2c354d0de53d3ac72 SHA-256: 31fa002514ffc30c19d4674f365726b44110f52a805760b7afd5456570124cb6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://pelibifir.ru/wix?keyword=the+force+awakens+alan+dean+foster+pdf PDF link annotation
    • http://tricitysikhs.com/how_to_clean_ionic_pro_air_purifierdqvbq.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/2kLjiia/pefisuxipigalifolemufopaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/JWxjihe/blades_of_brim_mod_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd1b54f9cab4.pdfIn PDF document text
    • https://cdn.sqhk.co/fezozepefik/4Gjjghi/jemitexumod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_60010c407c1c2.pdfIn PDF document text
    • http://bettermoneytips.com/davifexuwamixekulakewalaicz5j.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/wavafafeba.pdfIn PDF document text
    • http://kernig.store/ranumedejegikovil18x9b.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/jdANa2f/miris.pdfIn PDF document text
    • https://fomuropuzukamu.weebly.com/uploads/1/3/4/7/134728801/nevobisa.pdfIn PDF document text
    • http://vostokzapad.su/what_is_the_future_of_uspsbioyk.pdfIn PDF document text
    • http://wrestling-mma.com/philips_norelco_1280x_42_sensotouch_3d6na4p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/gadixa.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/how_to_set_up_infant_optics_dxr-8.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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 5348 bytes
SHA-256: aa24804b7ee5f796935c6265f38b108d196aa323ab0a440f9821382a078cab97
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 11396 bytes
SHA-256: 8bb41a8f957146eafa82de03cd52c2390ea581cfd316c3dc59c218ccbf0da68f

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