Malicious PDF — malware analysis report

Static analysis result for SHA-256 addc2dd86f5cc23b…

MALICIOUS

PDF

61.0 KB Created: 2021-04-07 01:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7907e55108bb38babf2d0ba15de833d4 SHA-1: 0c087bbdc0c460035e6128208058b20c82bb65df SHA-256: addc2dd86f5cc23b3a6ff7d88c616ae815365d938f0f5cd4a0d8dac220348e5a
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 disposable domains and are part of a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the ML classifier and ClamAV detection indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7927

Heuristics 4

  • 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 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://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/goxara.pdf
    • https://web.liderpapel.com/sites/default/files/webform/kivalin.pdf
    • https://www.termis.org/system/files/webform/53478461308.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/nutuzisujobipusife.pdf
    • https://www.mainephilanthropy.org/sites/default/files/ziladiweropisikiforab.pdf
    • http://seiary.com/sites/default/files/webform/rec/kutovaduro.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/95866450710.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/bikepekeroluxujopabiko.pdf
    • https://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/95859103094.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tatemomolefifepa.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/topijetidilotifoga.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/mubojezelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rapid+biology+pdf+free+download
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kizoromafogikigogusebef.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db40.bin
cdc3d3fda97975776c3fa4c49f38a9d283f9a39e9bf731d337d05b80eb1d25ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5080 bytes

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