Malicious PDF — malware analysis report

Static analysis result for SHA-256 708c72c44c1f5ef1…

MALICIOUS

PDF

67.2 KB Created: 2020-11-17 17:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 24b4c62877626857b06805a3a35cbd4f SHA-1: 1888827b10f41aac2ed6f259080b9fa1097522ba SHA-256: 708c72c44c1f5ef1c71e33c08bbd011ebe3573cd83d319be5f2be588e5fa1511
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or phishing infrastructure. One of the primary external URIs is trafffi.ru, which is likely part of this malicious network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=curso+de+mariologia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5fad319cbaef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5fadd00c01b1b.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/wojisazoki-turanipofodulob-libofixuza.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/f9ebf38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f9319b4d2d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5faebc280fff4.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/772b57b182c6abc.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/f3e28ecc-98ac-4cf1-b624-5299a81b6684/abbreviation_for_captain_police_rank.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/vaxur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d58e6f6-ca53-49f3-ac6e-4cb7625119c9/wamusupokuzijavasaxifoxun.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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 5268 bytes
SHA-256: ca8ec1f114ce2e2f6328580daf49b00540eb15c2da38d49b9d90acab7e32ae62
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 12004 bytes
SHA-256: c590b681044513b3879deec0bdb5aeeddfefc32f9fad83f1e336dcd8630f5b95