Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4e24920907d4af…

MALICIOUS

PDF

58.7 KB Created: 2020-12-11 07:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8bd565c7b989a7cb7e908c6474c40ea7 SHA-1: 9df33f294e0f8fbc25b59d74a37323cf14c5f10f SHA-256: 1a4e24920907d4afc1b203145d0ae451e33f6fb412806fc6b366658a3d32206a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffnew.ru/123?utm_term=smart+trike+assembly+6+in+1 PDF link annotation
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/zitawenejidubukudina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fb65fd539e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fa33de1c33d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f886a7332a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fa19f8e84c3f.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/kolov_givatatuku_bomuwino_zinosasepi.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/jedobufudajewu/structure_of_plant_viruses.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/22387544745.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/3235394492.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc066c960f2895dc1e54813/t/5fc3358618e72e5fdb4046e4/1606628762938/general_duty_clause_requirements.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_off0000a81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA81C 5448 bytes
SHA-256: 623a108c36900c043e069a0801db98fc20abd4f7d59e02e29114dda50c8a01bf
font_01_sfnt_off0000ba97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA97 9976 bytes
SHA-256: 679551a05e72a79f743269f18551dce5f6470d748c4b4ec5acacadc8209c81aa