Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff882041eaabd1a…

MALICIOUS

PDF

82.5 KB Created: 2021-03-14 09:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dad38d684aa9d194c179e83da9eb83f SHA-1: 379e1c53dd7cc3ba16cad2fa6f4b7dc6d130fa75 SHA-256: 1ff882041eaabd1af864a6e85178b908c93117711c1c47bfd664a31a0855fb24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to "Coshh safety data sheets" to entice users to click on the malicious links. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=coshh+safety+data+sheets
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fd62c29da25e.pdf
    • http://suwadebizon.mywebcommunity.org/oxford_chinese_dictionary_free_download.pdf
    • https://vevofuxideg.weebly.com/uploads/1/3/1/4/131405958/1112491.pdf
    • http://wujejejifi.mygamesonline.org/seedfolks_book_trailer.pdf
    • http://pumaguli.scienceontheweb.net/17669621748.pdf
    • http://zasazigupat.getenjoyment.net/amazon_affiliate_marketing.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5ff4a663f2e9c.pdf
    • https://cdn-cms.f-static.net/uploads/4367308/normal_603c87a2a57bd.pdf
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/90d212ae77cb.pdf
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/dixulimodugip-narejewetosonag.pdf
    • http://zibepifutidi.sportsontheweb.net/gawawipobalulo.pdf
    • http://kejumazinanu.mywebcommunity.org/nugevej.pdf
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5fc573f89d03a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_54b871b164ba4f1c92d7ea7ad25aa0d0.pdf?index=true
    • https://s3.amazonaws.com/geraromu/bush_baby_facts_and_information.pdf
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_c26e09a1999049d9a6c8817864a792d8.pdf?index=true
    • https://s3.amazonaws.com/jazofi/pathway_fistula_ani.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010832.bin
7cc296deb092feac64f07bc933305bfd6dc3d8653b74cee38a58b8d1f0ca2470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 4872 bytes
font_01_sfnt_off000118ce.bin
f98521b63ab81be4ffa20c5d0a9da6f57104217ac732b2030c16a8cc04e56457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 10716 bytes

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