Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90bc616f4225c7d…

MALICIOUS

PDF

71.5 KB Created: 2021-01-16 04:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fa4dd505be6ff2c9e3f1f6cdad16ee9e SHA-1: 95f8db89494b3ceff6c4c8f9bf3553dbc521bde9 SHA-256: f90bc616f4225c7d14abeed170396d50df77ea230efac1cbc8fc304c4dc6346c
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with a significant number pointing to link farms hosted on weebly.com and mozfiles.com. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the presence of numerous suspicious URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/123?utm_term=free+musically+likes+no+survey PDF link annotation
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/5810564.pdfIn PDF document text
    • https://bifetidenogu.weebly.com/uploads/1/3/1/3/131379340/rovaraminakan.pdfIn PDF document text
    • https://site-1168308.mozfiles.com/files/1168308/railway_platform_ticket_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/egeXQjj/boku_no_hero_academia_quizzes.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/gaxodamoxokilobewut.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/tiduro/portable_keg_cooler_bags.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/mr_beams_netbright_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/email_birthday_party_invitation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/binary_numbers_table.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 5124 bytes
SHA-256: 6b2b1834de744b27e4213a29da2bf536d4756c70eb1bc55c8a76ed6aaad8289b
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 11592 bytes
SHA-256: afe396914b0a375a8099c29175419d4fb988b7145d9c6d03a03ce2f792a840ce

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