Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9416fe5421cdb1…

MALICIOUS

PDF

74.1 KB Created: 2021-06-11 20:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f6048a1464bc1e515b1195582338aee SHA-1: d6496abfc8bf4103ce2c68f1f71bc1b30f3d6799 SHA-256: 9e9416fe5421cdb1d40e755eb4772b3b69bb53d1f5762df84cbc843f8bfa7448
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to .pbworks.com domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly indicate an attempt to direct users to malicious or compromised sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, further supported by the malicious verdict and ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/pbw?utm_term=harry+potter+blood+prince
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5feec4321ad06.pdf
    • https://cdn-cms.f-static.net/uploads/4495043/normal_605e1452cb689.pdf
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fe06dc28f673.pdf
    • https://cdn-cms.f-static.net/uploads/4476593/normal_5fe68e6c8f5dc.pdf
    • https://cdn-cms.f-static.net/uploads/4412591/normal_602a8089d7253.pdf
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/danokerewex.pdf
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/84a6dc667.pdf
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/patewovuzajeje.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_60c2ec7cb7cb1.pdf
    • https://tejelodaburibav.weebly.com/uploads/1/3/4/3/134317360/sapejadugeja.pdf
    • https://cdn-cms.f-static.net/uploads/4391624/normal_605f579766988.pdf
    • https://cdn-cms.f-static.net/uploads/4479237/normal_60bb7d9754284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gobujirewod.pbworks.com/f/75451307549.pdf
    • http://vulazojab.pbworks.com/w/file/fetch/144911709/tamidonefomitenelenirur.pdf
    • http://xobapotowi.pbworks.com/w/file/fetch/144659841/food_presentation_secrets.pdf
    • http://zemenifinabe.pbworks.com/w/file/fetch/144575070/aleister_crowley_tarot_deutsch.pdf
    • http://rugewenuzed.pbworks.com/f/88760676724.pdf
    • http://jutifakukap.pbworks.com/f/doubledown_fort_knox_free_coins.pdf
    • http://bowawesup.pbworks.com/f/science_worksheets_for_4th_grade.pdf
    • http://jamexapageku.pbworks.com/f/itron_sentinel_meter_manual.pdf
    • http://lagawiwefe.pbworks.com/w/file/fetch/144879576/berserk_volume_2_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e649.bin
f4c92a14670abe7c290b76bd9783ccb9d107bcebf1e9165fb777ed657e8b7d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5092 bytes
font_01_sfnt_off0000f7a8.bin
e573e7f600da6e881e9b3317e0b181aa1770c1eab797de0ea0cd3153c49fdf75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 10424 bytes

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