Malicious PDF — malware analysis report

Static analysis result for SHA-256 767a1fca8bbe6ea9…

MALICIOUS

PDF

66.0 KB Created: 2021-01-12 21:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 84ff8334e8d69402c1f6b69d50822bad SHA-1: 79bc6a29cb3d4b63d9f72ffb9a0f9e6080f8bbea SHA-256: 767a1fca8bbe6ea9a70debb08b3a69a5dcdc07de58de21341747d8ac7d44ceea
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, including disposable ones. One URL, 'https://traffking.ru/123?utm_term=mk+101+tile+saw+water+tray', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns designed to redirect users to harmful content.

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=mk+101+tile+saw+water+tray In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f9b5fa38e978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5fe8ef4ba9e43.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/d60f1457.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/dumejirisimagil.pdfIn PDF document text
    • https://cdn.sqhk.co/bikawegaj/haigsid/xipekupepotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5fd30fa42ad10.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/zageniforuzoba.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Ui0hghe/hitman_ps4_game_of_the_year.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fdda4be774c0.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/e94a2.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/4gdjhih/goldlink_crew_download_fakaza.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/75e52354168.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/a8VPyhi/abc_phonics_song_2_words.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45B 5136 bytes
SHA-256: f0edf9f28ef5f2929a9e6a5b67f0efd4138ac2c448ca8b9a0efa61d3ff260524
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 10884 bytes
SHA-256: c90ada4be342e54919c787b716b6f68bf1c51e4fec77c4f0b7c58a48156d9121

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