Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1fcef22d772f63…

MALICIOUS

PDF

107.1 KB Created: 2021-05-19 08:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b01a18b339929e3d91f2286cdbc989e SHA-1: 28ab02a816572ff3e8bdcc81aefce56ab40970e4 SHA-256: 3f1fcef22d772f6327d23ce86c6ca6ad94201cf6f081a1eb23cd7577ffe18609
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing towards a phishing or malware distribution scheme. The embedded URLs, such as https://botokaw.ru/strik?utm_term=jon+snow+x+reader+pregnant, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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/strik?utm_term=jon+snow+x+reader+pregnant PDF link annotation
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/samipesopup_pufiruvarexudu_jeruv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_60303316289ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_60297f4ad0666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_5fd977dbc66bf.pdfIn PDF document text
    • http://guwumuwepoxujog.22web.org/backstop_agreement.pdfIn PDF document text
    • https://peworiwuka.weebly.com/uploads/1/3/4/6/134693567/soxatola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_6056f79750e5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_60003752ee993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_606124fd3f362.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/183887c002b60a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_6007d04574359.pdfIn PDF document text
    • https://getivafet.weebly.com/uploads/1/3/5/9/135960962/zomarijalog_wegawegavilezaw_pudekoxebe_turax.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/vusinevap.pdfIn PDF document text
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/9059d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60162163948b2.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/8393005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebalakafepikob.rf.gd/chuyen_doi_file_sang_jpg_online.pdfIn PDF document text
    • http://sonupon.epizy.com/english_for_academic_purposes_unisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae71889-5375-455b-89ae-13bb55d0bb89/11156545414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6983c3-10ec-4143-96a1-d2392a4793ee/15237476128.pdfIn PDF document text
    • http://duzesonugineku.rf.gd/reduce_smaller_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c13d035-7e7c-4312-b222-66e4df3546f6/bass_tracker_boat_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b379c9d-fe19-40e8-9863-fd946b1766a6/is_circle_compatible_with_my_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1998840-5064-41d3-b7f9-194c9e2c5bdd/gitomaniwirox.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_off000164c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C2 5244 bytes
SHA-256: 1d88efa8daffb8a14456280a30c8985d9c11f32af0d16ce20a901379137c34a7
font_01_sfnt_off000176c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C2 11264 bytes
SHA-256: 0806ee1cc5bad1f5c2172cc4fe385853a8a81b88cfe2bb0fc9702542cea34090