Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47fdcdd992ceb00…

MALICIOUS

PDF

77.7 KB Created: 2021-04-18 21:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d990253d1e815b7f5363528bb60a9888 SHA-1: 55744e4b23b62ccb77331c0492d3e327b7c269d3 SHA-256: e47fdcdd992ceb00767db2fc0eda1321b8039f4d6ffac9890e62d9e078c3d8e1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded links, with one prominent URL pointing to 'vilenefex.ru', suggesting it functions as a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=best+witcher+books+ranked
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5fd84c2a63b62.pdf
    • https://cdn-cms.f-static.net/uploads/4369498/normal_604fa2a5cec17.pdf
    • https://cdn-cms.f-static.net/uploads/4385612/normal_60272269b61d0.pdf
    • http://zokuwazuza.22web.org/isometric_paper_printable.pdf
    • http://pazobano.iblogger.org/8745165526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb39b7b9-3d7e-4c82-8e33-519f8babf34f/95008896566.pdf
    • https://uploads.strikinglycdn.com/files/342f47ed-dc0b-4ecf-b63f-bb534341250d/watajoxikudutidubov.pdf
    • http://vebujameja.rf.gd/basic_spanish_course.pdf
    • https://uploads.strikinglycdn.com/files/b1b44c5b-b6af-4c9a-bbc2-55d9c584198e/mdr-zx770bn_not_charging.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_940fc24214e14accac92bc998741fc94.pdf?index=true
    • http://miredibe.rf.gd/how_to_type_korean_on_keyboard.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_2963f1e969b64b40b33384dc89b5b94a.pdf?index=true
    • https://s3.amazonaws.com/silubebebefuju/oregon_coast_community_college_nursing_program.pdf
    • http://goviragukipi.epizy.com/how_to_make_him_fall_in_love_with_me_again.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_35e7fe796e2b4655b6e354a8cde89e7e.pdf?index=true
    • http://dedufaga.rf.gd/jokobirefesajute.pdf
    • http://mowiredeponup.rf.gd/detisilubirupekidune.pdf
    • https://s3.amazonaws.com/bamepofewalada/organic_chemistry_2_cheat_sheet.pdf
    • http://dixuzudes.epizy.com/bread_machine_cookbook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d3.bin
a70faa38b0ba4a5ee691316e21a7eaa62c8efe6d52a9723687b5de8b61b438f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 5340 bytes
font_01_sfnt_off00010410.bin
dfb62f86af65476af66903e0d1623a2858d526e4bd52312c54b271e40c1dc329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10700 bytes

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