Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2fb9cd50ca7c5e…

MALICIOUS

PDF

80.3 KB Created: 2021-01-17 03:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 181de352a625d9df7e0357184b62665c SHA-1: 9a3e2ba0d4c35e07ddff8459348bc2b1194d02bd SHA-256: bf2fb9cd50ca7c5ec81a55fc85ba7c614c762f2ca3c97d9cd11a410721e3b298
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The primary URL, 'trafffe.ru', is likely used to direct users to malicious content or phishing pages. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/aws?utm_term=causes+of+depression+pdf+journal PDF link annotation
    • https://site-1177680.mozfiles.com/files/1177680/turbocharger_gone_apex.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/rilepesodiwa.pdfIn PDF document text
    • https://site-1177815.mozfiles.com/files/1177815/monkey_go_happy_4_stage_11_walkthrough.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/5345857.pdfIn PDF document text
    • https://site-1248811.mozfiles.com/files/1248811/quran_file.pdfIn PDF document text
    • https://fijuwokokaku.weebly.com/uploads/1/3/4/3/134382009/5465484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/basic_exponents_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bluestacks_for_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/the_waldrop_sextuplets_names.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/koxop.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_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 5016 bytes
SHA-256: b14fb2e4f232c5cfafe0483f0af0a1572abb9ea01378c273fbb98b8429c8579d
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 10840 bytes
SHA-256: 8139e27b0dbded0dce3988646f167f79f094e1bae0713e212535d1dd278c9989

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