Malicious PDF — malware analysis report

Static analysis result for SHA-256 d906a0365b48b119…

MALICIOUS

PDF

74.0 KB Created: 2021-04-07 13:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bc53b1791d58bef8e30c718e4c6c15ac SHA-1: 7ab9a4bac789da9e7138caa2be78b541682cb64e SHA-256: d906a0365b48b119071a03040222be0ccd5e9bec68d6030a0e9dbdf9f7d18e01
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and heuristics point towards the use of embedded JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8687

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ambrose.edu/sites/default/files/webform/42416127327.pdf In PDF document text
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdfIn PDF document text
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdfIn PDF document text
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/vinoku.pdfIn PDF document text
    • http://seiary.com/sites/default/files/webform/rec/wugibizipudaxejomite.pdfIn PDF document text
    • https://www.jwico.com/sites/default/files/webform/69174909787.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/93477879009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rearing+broiler+chickens+in+zambia+pdfPDF link annotation
    • https://lib.asu.edu/system/files/webform/61431168480.pdfIn PDF document text
    • https://gradfutures.princeton.edu/system/files/webform/86626084736.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 5832 bytes
SHA-256: a2b41e270674c8ab773ae1dc2abedb051a46cf8ab2b07c8776b18a2613a1ee1c

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