Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fccde1bf937384…

MALICIOUS

PDF

69.3 KB Created: 2021-01-08 05:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c878c0cb87b870101c983b3beef91031 SHA-1: 9d9b01972df3f958d8435b142112a961869a91bf SHA-256: 31fccde1bf9373840fe2b05af2a0b01fcc8d225ef717257ec199464ec368f5ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs suggests the document is intended to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=conjurer+guide+ffxiv+reddit PDF link annotation
    • https://cdn.sqhk.co/jidelugob/DHgdbhj/26675660055.pdfIn PDF document text
    • https://niboxevukok.weebly.com/uploads/1/3/4/6/134649508/nedimizavupema_lomidofa.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/KXhacFE/sosowegowufovukepazol.pdfIn PDF document text
    • https://vodemiteju.weebly.com/uploads/1/3/4/7/134722100/8978644.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/hd6idjb/2048_super_heels_hack.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/nuxepiduded/google_chrome_urls.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/label_stages_of_meiosis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/taguxegep.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/baseball_uniform_designer_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a4b752-a570-4fe4-93c9-030c82951487/tulefezasirene.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/aiken_county_jail_report_mugshots.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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 4764 bytes
SHA-256: bbefff880c995350c0a564c417212189b906297eed90e4a1ff3aef49b4deef0c
font_01_sfnt_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10292 bytes
SHA-256: c3ad36c95bd71246a364feabd2175fd7047ee2e896554e4a74db306bc403524a