Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fd64ade5b66d68…

MALICIOUS

PDF

69.2 KB Created: 2020-12-24 05:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 128a755cc0ed6690c9b6896b9f822d27 SHA-1: 187a4876b6d7d15c8df9e1b3b6561c35ef735d59 SHA-256: 41fd64ade5b66d6855061c2d727400bc384aa61cbc7d5df8f054f567ac63c904
164 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a lure for invoices or payments. It embeds multiple external URIs, with a primary suspicious URL pointing to 'trafffe.ru'. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malicious download attempt, consistent with the 'Pdf.Phishing.Trojan' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=hrrg+collections+false+billing+practices PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fc13b582ed43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_5fa7e9cb68278.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/2alNMhe/viramagovoxikufutafopo.pdfIn PDF document text
    • https://lekodapodigix.weebly.com/uploads/1/3/4/5/134500142/573163.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/5186087.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/ifibIhe/73890172981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c9041d-cda2-44b9-8e63-00dc32fdd3bb/rirabutaxugapebepo.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/93450685566.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/ok_and_cancel_button_in_html_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b7b175-dd8f-4d31-b63d-8ebf9bbf09b2/mens_fuzzy_socks_old_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/makejuje.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/35447220253.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/poptox_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16816180-b718-4e05-b4de-7b4ce4d1f003/39221554326.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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 5284 bytes
SHA-256: a2055a94ede4d4ce537d7db329ad5db38e8e6b0388d948f0dad351195f0ea0cc
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 11204 bytes
SHA-256: 25a100eeaf96ea3b238acefbe56e0d193bcf5c4bd596083b29dd3bcafed50c7c

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