Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6256f53aca23735…

MALICIOUS

PDF

89.8 KB Created: 2021-03-21 04:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d545e8501e2a007b6a96dcd5f8001911 SHA-1: 9fff17a61a925d0778a0b581a41132c5483c4f94 SHA-256: d6256f53aca237359052a1d82e37dfc15b152a603c00739b57235862b77bbb10
116 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. While no scripts were extracted, the presence of external URLs indicates potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=husky+hand+tools+lifetime+warranty
    • http://getepitisux.mywebcommunity.org/hernia_diafragmatica_veterinaria.pdf
    • http://fujigukatujewu.medianewsonline.com/8993637472.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_603a0fe5e3836.pdf
    • http://siluvuxifebul.medianewsonline.com/ctet_answer_key_2020.pdf
    • http://wugegifa.getenjoyment.net/pejoburopabufa.pdf
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fe5f97c51751.pdf
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5fdc6b6398131.pdf
    • http://ruguwafe.scienceontheweb.net/ampli_operationnel.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_601e9362b6828.pdf
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60388a0087291.pdf
    • https://cdn-cms.f-static.net/uploads/4370080/normal_6038cdef91841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_b929a321f85c4609a51d6606e10920c9.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_5b53abae45874181bb806069d6992c7c.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_0f49df1efaf442938a5d436662fb74e4.pdf?index=true
    • http://litorow.myartsonline.com/fodizuwinufufoxaxexezixe.pdf
    • http://tirisesu.onlinewebshop.net/tree_of_life_back_tattoo_ideas.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_fc9d5c3a9167440594013a2a1e49d929.pdf?index=true
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_c145a2e2e10744778700bc14d7484252.pdf?index=true
    • 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_off00011f78.bin
04482558f07c60613413a9e3d219f586dcea31b88dc783c03f39223436be2e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 5364 bytes
font_01_sfnt_off000131a4.bin
8823a3e48375f37be745083e24f5aecf21f742251ebf349997c5b668df30dc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 11376 bytes

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