Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1bc1207ac6861c…

MALICIOUS

PDF

71.5 KB Created: 2020-12-13 22:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 387aee8f3552fdbbe4fb8ac406da7388 SHA-1: 7a4affd5f1dd13499424e7b9722bcf468ba2faa1 SHA-256: bc1bc1207ac6861c63786e1c8a77a36c8c912b7c519752b33f634e7f78c0043f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One of the extracted URLs, https://trafffi.ru/aws?utm_term=business+card+vector+design+free, appears to be a lure for users searching for design resources. The primary function seems to be redirecting users to potentially malicious or spam content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/aws?utm_term=business+card+vector+design+free PDF link annotation
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/kekukere.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/9703756.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/tunonin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_5f91ad1a5d1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476148/normal_5fa774afe8147.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/9737596.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/wuzowojatabigi-lowojoduka-famiziwowukeso.pdfIn PDF document text
    • https://povelelowu.weebly.com/uploads/1/3/4/3/134331265/wumor-nuximekunupikif.pdfIn PDF document text
    • https://lugejalafomap.weebly.com/uploads/1/3/4/8/134884490/494567f.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/51920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_5fb617ac7b493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fbca7dfe1eac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc53da9affbf90a66070036/t/5fc8c4e2ec83506b04821a6f/1606993124698/82689355684.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/anatomy_and_physiology_pre_lab_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49f91972c46e3c94db3b/1606371833692/watertown_ct_dmv_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/share_chat_good_morning_photos_telugu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 5268 bytes
SHA-256: 86415ca84a4f10a3fa6cbf7b5529cdd66404afb03eb0ee5ef9bf9d619abfd27f
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 11244 bytes
SHA-256: 0e36d81a23b4384ad38495ec466b8d72ba5071c068dbbdb97ec998a25f5c7195

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