Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6aea056fdb3125…

MALICIOUS

PDF

96.8 KB Created: 2021-03-03 16:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f6bcd04c6277805d45b36d53e43b2179 SHA-1: b0bfb1a6f41e593a0e81efcd1768e3719eb5aa05 SHA-256: fe6aea056fdb3125284c0752bd66974eca1b422fe718d2fa893fd40da4e5fd42
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to benign-looking documents on S3 buckets, but one critical link to 'fokemale.ru' is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to language concepts, which is likely a pretext to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=concepto+de+lenguaje+segun+autores PDF link annotation
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/bda3f049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5ff56ea18bd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_602695f08416b.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/walam.pdfIn PDF document text
    • https://senugosuka.weebly.com/uploads/1/3/1/4/131454109/cac1b723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_6033301270bb3.pdfIn PDF document text
    • https://pedugosiv.weebly.com/uploads/1/3/4/6/134622687/5884500.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/jagux/practice_math_worksheets_for_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/movubalisogutigijix.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/compliance_report_meaning_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/sound_card_oscilloscope.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/texoxuminokepof.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/is_bakery_business_profitable_in_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/5026256630.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/44527858131.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/busumirisareb.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/bootstrap_4_horizontal_form_multiple_columns.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_off00013d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 5224 bytes
SHA-256: 72dec39a9f84691d910769228e6060eb6559b0e16edd82f63f1a27bcc3e4e169
font_01_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 11476 bytes
SHA-256: 16a5b562b44d1edc80982c07227a7a4182191232bd01056a8f6a710923ab295d

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