Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67547a3dc3b060…

MALICIOUS

PDF

79.6 KB Created: 2021-05-03 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf77dd674ee7001b8fc55400e436eb06 SHA-1: c7435f25d18404d2f430e0d2cf983ac2a543df7d SHA-256: 4a67547a3dc3b0608c539d5d8fa7f8c9933a0d6f08eac3e4bcf6031bd59683e0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded content, though obfuscated, appears to be a lure related to search terms, further supporting a phishing or malicious redirection attack pattern.

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://zajinet.ru/strik?utm_term=rain+down+jaime+cortez+chords PDF link annotation
    • http://steh-sistem.ru/48575845663gp51t.pdfIn PDF document text
    • http://vidclips.design/nuvimubaveromabinisatejumvpjp.pdfIn PDF document text
    • http://openplafond.xyz/tejexabejafezejavasc21.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/995a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393026/normal_5ff1bc27676bf.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/gidadurewilizipav.pdfIn PDF document text
    • http://twitter-center.com/metformin_dose_in_renal_failurewey6d.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/4413010.pdfIn PDF document text
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/c84a2d9ed031b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_6016c7606eadb.pdfIn PDF document text
    • http://lifeit.pro/94339654583sbuo0.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/nirilusufovog-femudanafediv-mezixedax-wosazobotomuzov.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/96b8256d1da.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jhlhejf/96631265710.pdfIn PDF document text
    • http://save50.pro/pusopunupifuzezaduvadewojsxkzh.pdfIn PDF document text
    • https://vapigoje.weebly.com/uploads/1/3/5/3/135391726/53f9e3c.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/ratusajabid.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/heheojd/original_ice_cream_tripoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 5372 bytes
SHA-256: 7adc99002c6d22ca94079a616fcf0280bd3b261f055a98d3f8c4f22621eefcff
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 10860 bytes
SHA-256: 6355da0cd3b5b8fff4e93f8e7e84a2a8d6258ff63ab57cecc7339fdef800c508

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