Malicious PDF — malware analysis report

Static analysis result for SHA-256 6729a4aa763e03ad…

MALICIOUS

PDF

69.3 KB Created: 2020-12-20 12:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9782ebf73d04550b68e9325b179ce7da SHA-1: 735399d3cac2aa56a9b3175afaaf95dcff27ffb1 SHA-256: 6729a4aa763e03ad3dd41a4729786d49b70c09e5294750e54af6f2bec4df083e
214 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection further support its malicious nature, indicating it is likely a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/strik?utm_term=goodyear+assurance+fuel+max+-+215%252F55r17+94v+reviews
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/zewug-pagokaduded-rodoxuzapaj-nosumolagomura.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/dotomuvizon-digupuwugedafu-gopewunudufutor.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/10a4b3a2ad34c0.pdf
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/bijavevez.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5f9201b09662f.pdf
    • https://visimivaxel.weebly.com/uploads/1/3/4/7/134714962/kotegiganotag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a1cf920-12a6-43be-9dc1-516d5f716f22/estudiar_biotecnologia_en_mexico.pdf
    • https://s3.amazonaws.com/retobifulipo/ganikagazazawab.pdf
    • https://uploads.strikinglycdn.com/files/28b7ca37-90f2-4196-aefe-c83f644af452/fekaritafewodo.pdf
    • https://uploads.strikinglycdn.com/files/4786f5f8-7153-4f15-a5b2-9477a0e55bc7/bodybuilding_jamie_eason_phase_2.pdf
    • https://uploads.strikinglycdn.com/files/d0c6dcaf-4e5c-4869-b380-b36fc51cbc43/primal_clash_toys.pdf
    • https://static1.squarespace.com/static/5fc6e713cb936d6a06a62389/t/5fcad94c26a2be7f6dd7e27f/1607129421537/train_cab_app_download.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_off0000cc68.bin
c4e2a590608886a6acb43780bd349010d20c004df5b25750ba417dfa8fa7df2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 6220 bytes
font_01_sfnt_off0000e1be.bin
eef1237b32be5c546144ab29a6c9e27962b3e606f28dbae99998bf0f64d1ffc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 10612 bytes

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