Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0a9dafca719ba7…

MALICIOUS

PDF

73.0 KB Created: 2021-02-26 15:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f352b24d9c59ece7726db5a2a3afd5 SHA-1: bbc51b3cd37e468a0f7ee897709a252d2080e42d SHA-256: 5e0a9dafca719ba7952d134a0bdc6d4dc12535b2b10cff34c0c566035cd0f2bb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure itself is also flagged for duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=embry+call+dad
    • http://rubewox.sportsontheweb.net/city_of_bones_cassandra_clare_shadowhunters.pdf
    • https://static.s123-cdn-static.com/uploads/4454042/normal_5fe39d8d3f53f.pdf
    • https://cdn.sqhk.co/rabuvimi/amEN1vp/vekuzapulorijogagulajamo.pdf
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/8443735.pdf
    • http://gefosezidubajoz.scienceontheweb.net/koratatipu.pdf
    • http://jilet2.club/45386824202zkmmi.pdf
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67f91d2546.pdf
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fe03068a0f4b.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_600de1fdb7aef.pdf
    • https://siropenisawad.weebly.com/uploads/1/3/4/3/134353493/cdac5.pdf
    • https://cdn.sqhk.co/bipozipo/igeRigb/95329475781.pdf
    • http://xojuxelase.medianewsonline.com/pufixozatopulat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gowegonuma.epizy.com/vebakozovefesaref.pdf
    • http://xuvekixofeku.onlinewebshop.net/ap_world_history_matching_trios_1900-present.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_off0000e366.bin
c646efb7dcffae6c9dea721c39275ca077fb8edd073c58672bb2cd0eb810153e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 5108 bytes
font_01_sfnt_off0000f4b6.bin
38b5e69cfe8202b6639e6ffdf5615fb2f75b3b69c8f935af4734b60c23055d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10172 bytes