Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6737180cb5149a0…

MALICIOUS

PDF

67.6 KB Created: 2021-02-05 11:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8015c9ba7b13c525e4c8dcba796afd20 SHA-1: 47d6b5fc9823753ce449b6ab372b61a56ee57fe9 SHA-256: a6737180cb5149a0254775c1b7b4b8a6b0b476854fa2075daa1258cfa0cedb81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8906

Heuristics 4

  • 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
  • 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://bologen.ru/aws?utm_term=chinese+font+brush PDF link annotation
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/fc4e23033916fe.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/vulagegozug.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/490327.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/jomubawusigejigotu.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/94437f.pdfIn PDF document text
    • http://sazasebum.iblogger.org/waxepamaximab.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/5476097.pdfIn PDF document text
    • http://vatojaginasi.22web.org/fewenikudururipilex.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/3842551.pdfIn PDF document text
    • http://idealsit.space/29085657626nv5eb.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/e8c2d1f.pdfIn PDF document text
    • http://womutefipile.epizy.com/salary_guide_singapore_jobstreet.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/24456203200.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/difif.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/english_font_style_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/arteriovenous_malformation_hemangioma.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/62450160858.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 8352 bytes
SHA-256: 4a0f2f483b2a8c482244d7e7716dba8a9fba699c8f287327e68b2a841b940390

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