Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e61956f298a16…

MALICIOUS

PDF

79.9 KB Created: 2021-06-06 11:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4eaf768a521659f475d0cf6ac72e7d52 SHA-1: 90d210dae3d06baabd1bcf0ee9ed2bcad62bd91a SHA-256: c50e61956f298a1608ffdf5c0bd8625fde3694ac2411e94e0c7d011a96770276
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious 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
  • 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://huntic.ru/pbw?utm_term=migrationspakt+text+deutsch+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424646/normal_60b83e7e145ad.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/f66c4e425b8fe61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ff63af82ee6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_603aa8b48378b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd820989cb1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ffca8642660b.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/9daf7d8a473924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_601fefaa9e28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_60bb0699032e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zemenifinabe.pbworks.com/f/ielts_reading_general_training_test_with_answers.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_many_species_of_dinosaurs_are_there_in_the_world.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/28007107615.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/how_to_voice_chat_on_discord_mobile.pdfIn PDF document text
    • http://vazufatar.pbworks.com/f/birlemi_milletler_szlemesi_maddeleri.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425505/rogaluzirelowekobipevemo.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144581337/xelejuvawewabasuput.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/f/xetijupixolakul.pdfIn PDF document text
    • http://malamojozag.pbworks.com/w/file/fetch/144685368/wild_rose_detox_cookbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5404 bytes
SHA-256: a9da4210cc965d32210a4f25a72828e5710c59c09114b0ffc5a203b48393feb7
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 11596 bytes
SHA-256: b508c0858b953352980776398de756f151c53842a1d8dc437a774941372cb340
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378