Malicious PDF — malware analysis report

Static analysis result for SHA-256 8585dcac83b00a36…

MALICIOUS

PDF

75.6 KB Created: 2021-05-06 18:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdedf17a2a26ac2de6a94b4a76025ccd SHA-1: 0f8eba506d6b1a980d3124d0b2719dc58701a6b9 SHA-256: 8585dcac83b00a362e326befa35492d3f6fd9dca7db98b7b65ba45fb46d40326
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL suggesting a lure related to song lyrics. Heuristics indicate the PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=les+miserables+songs+on+my+own+lyrics
    • http://rexevivejegox.scienceontheweb.net/weka_j48_classification_tutorial.pdf
    • http://loxiturizule.sportsontheweb.net/vezekiwivige.pdf
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/76bfb38be312c.pdf
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fddf57c98ad4.pdf
    • http://nadefememidep.medianewsonline.com/3170188473.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_600f1e938d50f.pdf
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/mulojanug_manafobubipe_vatedeva_fusepadejaferu.pdf
    • http://lirebuwoke.mygamesonline.org/carcereiros_livro.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/forifopawosibol.pdf
    • https://cdn-cms.f-static.net/uploads/4476285/normal_603defbac13c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wojibikifi.myartsonline.com/89368160058.pdf
    • http://nudagimanefej.atwebpages.com/40282690179.pdf
    • https://s3.amazonaws.com/bipovoromoj/dinner_for_schmucks_full_movie_free.pdf
    • https://s3.amazonaws.com/jafujasiwetid/sarabureb.pdf
    • https://s3.amazonaws.com/gulapore/deed_of_assignment_of_contract_template.pdf
    • http://newemepakirid.myartsonline.com/relefujipavuzuz.pdf
    • https://s3.amazonaws.com/jezekemunidup/sorepulawapetiguwul.pdf
    • http://puvapulugo.onlinewebshop.net/gewakofu.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_off0000e90e.bin
393e6472881fc372378e59bc95577f4c90805a267bd51162fa05a1229767ebaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5396 bytes
font_01_sfnt_off0000fb6b.bin
0188e3b7cc8e2f8a598d99410609d943cfd69cf3b7b572e2f665d03162433277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10812 bytes

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