Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e7f17345e8b64f…

MALICIOUS

PDF

71.1 KB Created: 2021-03-15 23:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1777c58f8b06180aecd006cf4d6f9c2 SHA-1: 22a9202d360ad078f8945cab9564e13303c601ba SHA-256: 28e7f17345e8b64f6a9fcc26e28b252d6ba5490b1adffefc609d76dde407db6c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful sites, aligning with a spearphishing attachment initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://botokaw.ru/award?keyword=mandelbrot+fractal+geometry+of+nature+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5ff87d40cdd40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_602d652ded26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe80dbf34f1d.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/icGgdK3/22577611925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_601f9a6e09ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_604ae3708aede.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/jjhe8jc/matchington_mansion_cheats_level_911.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/DcBqwgc/screen_recorder_without_watermark_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6030476f2d5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5fd88c52599e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60110b3e9734f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_60272c962bbb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_60313698f1663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fe2677a7790e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_4aa55dde3f504f04a8e9be59020cb816.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_61b07eb89bf241dda31fc0edc26812b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/298fdcc2-3c1f-480c-bc73-0cb333e06f68/red_rising_movie_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd5e206-7231-474a-aa3a-d3a2b95d642b/86550636827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532588bd-18f6-4420-9669-eca02b08130b/wopilivorotipovuwoxisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f1771d-e453-47ce-a2cc-35bc1fe5855f/samsung_front_loader_washer_replacement_parts.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_a586d7545cb2475d8465d55eff15ea4a.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_ac6a85c27de8464798fd696fa8cfcfd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6aad2d-eaef-4227-a08b-0255f44fcfc4/59137712313.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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 5544 bytes
SHA-256: c2b129ca583a21e85618d62e7456f4c4f1c9ce1665f5dcbfc8161791769c8729
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10728 bytes
SHA-256: 19e13b90a63740688431123f6ad45c25962af3dcfad941c03d66394cd12fe296