Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf78aa401b54aed8…

MALICIOUS

PDF

71.5 KB Created: 2020-12-24 17:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0667b0489fe83004749c3594fa868635 SHA-1: 8deaf88c8d3a371443e8aa69e20914a8dcc5fd05 SHA-256: cf78aa401b54aed8cb71349c5e4d0b781b0b1bcf323f2748236cfd4bd8a54d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or phishing attempt. The document body contains garbled text, indicating it is not intended for direct user consumption but likely serves as a lure to exploit or redirect.

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://traffset.ru/aws?utm_term=income+guidelines+for+medicaid+in+north+carolina PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fbd81a5291e5.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/IhgEiie/sowuremeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f9a40104e118.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/f6Mlgdl/nekonesixup.pdfIn PDF document text
    • https://cdn.sqhk.co/lanabeja/RIjj1Re/valazewodarikapugudale.pdfIn PDF document text
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/gogurul.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/jj8jcgc/28508339464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8921ba01c7e.pdfIn PDF document text
    • https://kamejufozafa.weebly.com/uploads/1/3/4/8/134891268/2243775.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/cibigMU/mebobalajerugodimemot.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/lusabifef/ronapuzevobemupezov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611952a3-98e1-47db-8849-8159a1f3b470/mosefifugodaxewupikazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347f6ece-4daf-46ac-b5f9-021d05476320/rokidigatitewajoruzixavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e7d012-5b9a-4073-a4d3-68f9816a0f6c/pokemon_trainer_class.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5372 bytes
SHA-256: db24c8b8bd607036bf9e2d133c0d8fdfc6c75f31b4bdbc25705e0f76e8ac5497
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10464 bytes
SHA-256: c4b42bd247c93912e5841daa9e4a96d75ff4fb29d57d9fff8709571df835021b

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