Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb321f88e56c79f…

MALICIOUS

PDF

163.2 KB Created: 2021-04-14 12:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 896a05af89f16e3700af8b617e0aaac3 SHA-1: f50222cab10ed89871af013e2a4c4859a4e358db SHA-256: 2fb321f88e56c79fd4090dfffd897ae81cec94adbc8b4b28d5504a6b78e67bcf
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=triton+atm+instructions PDF link annotation
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/sugufegafekukevexe.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/e5db8388d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5fd382e61f173.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/0f3c1a40051070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6050bb7463cd1.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/dexorufamukegab_defonepulidivos.pdfIn PDF document text
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/c39485d3626dd.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/8399798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022c9203a1c5.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/2860341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fd14467874b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_6064fc3e35f2c.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_111ec82e8aca4e96a35df6497e02bc8c.pdf?index=trueIn PDF document text
    • http://dusipesubabaf.rf.gd/40370720133.pdfIn PDF document text
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_38bf0ab072e446c9ab63fa3c16a5b73d.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_94a7760796744a3aa2cbc5c59d978b26.pdf?index=trueIn PDF document text
    • http://vedemadujujipo.epizy.com/70584714443.pdfIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_17f1d15720f54586a77413a9454d0d50.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_06925cdbba194e2a9646f185309ac645.pdf?index=trueIn PDF document text
    • http://gorokezawofor.rf.gd/shoretel_230_speed_dial_setup.pdfIn PDF document text
    • http://duvirero.rf.gd/best_converter_for_macbook_pro.pdfIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_a3b2997451064a26982c26f935335a90.pdf?index=trueIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_6777c13a0b684f268cbc0df4eb73d452.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_6c44e4a744ac4e6084cd211756d22d5a.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_05677d2a36d3469f935103f52004b5c4.pdf?index=trueIn PDF document text
    • http://vexowiwoputam.rf.gd/gstr_3b_calculation_sheet_in_excel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000229c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229C8 7424 bytes
SHA-256: baaf0e0d8f840d21d6c1aeca3a03990a134690b16d2da7a7111ffbf7f783fcea
font_01_sfnt_off000241bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241BB 4860 bytes
SHA-256: a105031465d4c9f619b3b9bac2b31048d1eb3a228891bffb64faa80764193581
font_02_sfnt_off00025227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25227 12584 bytes
SHA-256: c86ff3287367a8f07b0b4562d5ea467f8876bb91ae95f98dc0278a5f4939b5d9