Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bf350d60ad1f76…

MALICIOUS

PDF

75.8 KB Created: 2021-04-25 13:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002603c580bdc41bcbb1cd0b7ca62900 SHA-1: b0a88dc764653d06c2b0233b39b03a4c482b04bc SHA-256: 38bf350d60ad1f7646cfff14a1b6dee60265fa0d4dcffd830c3a538ba4f9bf59
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('resalured.ru'). Heuristics indicate a link farm and a callback phishing lure, suggesting the document is designed to trick users into visiting malicious sites or engaging with fraudulent services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=directv+genie+mini+4k
    • https://static.s123-cdn-static.com/uploads/4412775/normal_5ff64be47ad63.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fd6836b43c2a.pdf
    • https://cdn-cms.f-static.net/uploads/4457861/normal_60633c2760c9a.pdf
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6009f8b084ba3.pdf
    • http://namafafiteg.mypressonline.com/36032123919.pdf
    • https://cdn-cms.f-static.net/uploads/4404107/normal_60599013a7d2b.pdf
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5ff962f6990dd.pdf
    • https://cdn-cms.f-static.net/uploads/4384464/normal_606e48ce9417b.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_605eee345c714.pdf
    • https://cdn-cms.f-static.net/uploads/4402481/normal_602884742c820.pdf
    • http://xepelewatelaziv.getenjoyment.net/bifanodan.pdf
    • https://cdn-cms.f-static.net/uploads/4462694/normal_60511613088b2.pdf
    • https://cdn-cms.f-static.net/uploads/4490121/normal_603bffe23cb72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kivarutumo.myartsonline.com/ketogenic_diet_free.pdf
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_aff7f5ff13b8417a919093c282a8927b.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_2fa098623749486da1938a152786e2f4.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_8c89233e19ce4691a70a60a9d5e93c61.pdf?index=true
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_c1be0add21ab4d1bbd91c59b6ffcac1c.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_2f2ff924a8554b79aa2c0e87fa362e2f.pdf?index=true
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_225c1f58f850490498e2b5b8f9bbb41e.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_cab6ff8ed79f46698c8e5cebd601bbba.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_e9457ab565894d55a43c0711638894ac.pdf?index=true
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_909c2f2c93f040edb114b8282731dc5c.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_off0000ebd0.bin
f166e816efda0ecb22ac613f1c772e519bbc44af08d2a8c51b2f0e96889acb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 4908 bytes
font_01_sfnt_off0000fc8c.bin
9ee643070be5318888c49b85d2b74195fbca8a57fddd60ca3d890f3bcc41912b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10864 bytes

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