Malicious PDF — malware analysis report

Static analysis result for SHA-256 7630fc7141eb9cd1…

MALICIOUS

PDF

55.8 KB Created: 2021-04-15 16:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65c460ffab97b4ede627e5dc4d3083c SHA-1: 96e6405bb85127e0c1bae6595113fed4d0b75240 SHA-256: 7630fc7141eb9cd1455b0257ef3ae439ef3664d71a136ac4fa25ca9529177845
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, many of which point to disposable or unknown domains. The document body, though heavily obfuscated, contains text related to collagen and application details, suggesting a lure to trick users into visiting these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9068

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://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://www.blplegal.com/sites/default/files/webform/25596831819.pdf
    • https://www.a1touchsolution.nl/sites/default/files/dovav.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/tixatikuwasa.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/geguridafaj.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/taxebuvokorutupimapo.pdf
    • https://www.uts.cw/sites/default/files/webform/nukuromenalifaru.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/41319995155.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/woluweweketasuzizolog.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bariwogutal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=desde+que+edad+se+puede+empezar+a+tomar+colageno
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/xegenaxug.pdf
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.pdf
    • https://community.princeton.edu/system/files/webform/luzixuganigofifabeja.pdf
    • https://community.princeton.edu/system/files/webform/jidubiziro.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/86402477901.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d057.bin
1540506327eab35d01a6e00214366953cbdceea1bd414949e925b4ba73834c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5568 bytes

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