Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cafcea989a1c980…

MALICIOUS

PDF

80.4 KB Created: 2021-01-06 07:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f85a1959a5f4f3194e4a7cbbb4976b70 SHA-1: 2431eecf542f6175b950ec0a466b536a978c3c17 SHA-256: 5cafcea989a1c980a5bd5d8a3768c412be9f3acca90cc776b1ab7ff642313109
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The document contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=understanding+analytical+hierarchy+process+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5fdeaf6c1d87d.pdfIn PDF document text
    • https://bogujodoj.weebly.com/uploads/1/3/4/8/134881838/2d51d6609.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/xakima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_5ff1aeb70089b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd6383144a66.pdfIn PDF document text
    • https://fosewusoxakuw.weebly.com/uploads/1/3/4/7/134707282/pebolilepafim.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/6671817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd3226fb77e4.pdfIn PDF document text
    • https://kizozadasope.weebly.com/uploads/1/3/1/1/131164448/kepuzedifupap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5f90890b738b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf592b9-3a52-4677-90ec-d75906af7591/best_two_player_games_xbox_one_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c202d4e3-f437-4de8-b902-459e1507de33/xunasikawezirubasarixujid.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e417c5-b75b-432b-a607-fc5d3ac0f9ba/poginosinakemir.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/stoichiometry_map_for_chemical_reactions_worksheet_answer_key.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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 5508 bytes
SHA-256: b9a179c88170b99bf641e01fdc36266e29b41e42d9d9ce8fdb80ed97ff7e8cf0
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 12236 bytes
SHA-256: e9e38b53d3bf38208ee8bc6f3656349bdf818f4793bd0843a400fbad2488f81d

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