Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef4ccb0b49c2990…

MALICIOUS

PDF

64.0 KB Created: 2020-12-28 18:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5b34aa087efd00835b4aae548269491 SHA-1: 76b590b3b5698e94ed2058b26c80c97e7a792a17 SHA-256: cef4ccb0b49c299040b72a225bed925342c419040983a50b07ee72da9ab8ce5d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, with a primary suspicious URL being https://trafffi.ru/strik?utm_term=machine+gun+sound+tone+download. The document's structure and the high number of external links suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/strik?utm_term=machine+gun+sound+tone+download
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/3165200.pdf
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f91ba2888a7d.pdf
    • https://ruwaderuxelelu.weebly.com/uploads/1/3/4/6/134651282/zuburinarawolitur.pdf
    • https://tefaxupafovox.weebly.com/uploads/1/3/4/8/134855259/8196933.pdf
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/mosigalokuvu.pdf
    • https://dajegasizof.weebly.com/uploads/1/3/4/4/134469490/ridelagumaz.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/d168944e22ef23b.pdf
    • https://zabamaki.weebly.com/uploads/1/3/4/8/134849969/d1757.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/pusudise-firafeberedoj-wudibarulivovar-timew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/046be935-7f7a-4c7a-9041-145e89ff079f/tofexu.pdf
    • https://uploads.strikinglycdn.com/files/f8aadf3a-0f55-40b3-8ae0-88f44c8e6ff0/tlatilco_female_figurine_content.pdf
    • https://s3.amazonaws.com/jenagubadopi/eclipse_ide_cheat_sheet.pdf
    • https://s3.amazonaws.com/bisapovepizaj/cheers_in_spanish_informal.pdf
    • https://s3.amazonaws.com/wufujudisu/27614999060.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_off0000c00b.bin
aa58abb1f0a421255fca091533ea9402fced90ab18def5a23c177b957a30dc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 5204 bytes
font_01_sfnt_off0000d1d8.bin
8adc0a3437a2911bd07c8777b96a225424a914080f0e47a5946db7277de6e80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 9824 bytes

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