Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1497fc49cab5a6…

MALICIOUS

PDF

75.7 KB Created: 2020-12-07 22:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c18ec2b5f419458b0f060fa97825a57 SHA-1: 1bbb68972999acc9232082ba8783466bd28e7d38 SHA-256: 3e1497fc49cab5a63293c8725f595a205ae15dd1df885c5074abf4bcc2704b29
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://trafffe.ru/strik?utm_term=inova+9+quad+core+tablet+pc', are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=inova+9+quad+core+tablet+pc
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/a06fe7e0f6e263.pdf
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/29313a.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/dukurofosali_wopuluribop_ziwusezutaweveg.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/guranojever.pdf
    • https://boruwimuruliv.weebly.com/uploads/1/3/4/8/134875556/8706670.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/zokonifekom_gudov_desazatugi_zilutofil.pdf
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/bba779d3d76e.pdf
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/bimajojuginezime.pdf
    • https://cdn-cms.f-static.net/uploads/4427506/normal_5fb96486be8b3.pdf
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5fa5935d7991f.pdf
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/xofubojejiwavuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bopuxosavubare/lanolirunare.pdf
    • https://static1.squarespace.com/static/5fc51c7c88c99b6d37c2838b/t/5fcd047a8a55f2188b7b3cba/1607271546437/87877208401.pdf
    • https://static1.squarespace.com/static/5fc5982e085bf90c0e1d0cdd/t/5fc9684f19890c408b1d49a6/1607034959874/german_chocolate_bundt_cake_recipe_using_cake_mix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d048.bin
2aa8b84a942fdb91d72dfaa669528610ea694de142ee9aa8ea23d38549ad14a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 7748 bytes
font_01_sfnt_off0000ea5f.bin
071443e20c4963369820637afa6a0ba55aacb7f6c0f873735e0de5ff2436d885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 5308 bytes
font_02_sfnt_off0000fc77.bin
8ae2db4436c471d552add4753f0d20c86c29ce03c407c7ac8925b786c23d26a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10856 bytes

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