Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f667667e503c0b4…

MALICIOUS

PDF

94.4 KB Created: 2021-01-17 00:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4b8dac6309f63145e15418c15537eeef SHA-1: 2124a5baf348c9ee0b22acbf98f803c283c19c4f SHA-256: 8f667667e503c0b48174b7989240b03f2dd2ebb04d23622476df435a6caf3515
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'trafffi.ru'. This suggests an attempt to direct users to potentially malicious or phishing websites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffi.ru/123?utm_term=mlp+eg+sunset+shimmer+fanfiction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449789/normal_5fc1f1d2a0510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f87d27284513.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/Hjdiafr/94875082591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f9036c1b834a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fb3fd0df1d31.pdfIn PDF document text
    • https://doxigexuwalo.weebly.com/uploads/1/3/4/7/134708718/xalivokozixo_walafinupewigof_vatogopubato.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/cggbchb/fixed_cost_formula_managerial_accounting.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
    • https://s3.amazonaws.com/lomogas/rsmssb_computer_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/the_american_flag_vital_facts_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/letter_n_activity_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/vifiwoxaruxureweludelug.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/reading_rhetorically_4th_edition.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_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 5316 bytes
SHA-256: 229e9231f256f75d6e2377848bbad2004ae9adf627963703d3e79e3d8eed70ad
font_01_sfnt_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 10820 bytes
SHA-256: 0b3da00993e2dc0d9d89a00e234ba98e232c4e3a78955fc91f20f2639e18e588
font_02_sfnt_off00015e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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