Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a36224fb4db68f…

MALICIOUS

PDF

84.1 KB Created: 2021-04-04 00:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87bb57abc0b79d1763fed98c0e211fd SHA-1: 227d99d83d1bcd3ebc98be2a8a3627714a096416 SHA-256: 66a36224fb4db68fdc46764abf754b332db761f948a3cda5531b889e8e04fb02
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The primary malicious URL identified is https://golowaki.ru/123?utm_term=calorific+value+of+fuels+experiment+report, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=calorific+value+of+fuels+experiment+report
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fe628e94c82a.pdf
    • http://ninotekega.mygamesonline.org/is_minecraft_on_ps_vita.pdf
    • http://mikovil.mywebcommunity.org/amalgamation_of_company.pdf
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fd0bbece338e.pdf
    • https://cdn-cms.f-static.net/uploads/4383921/normal_604f50e675c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fd3b031c486a.pdf
    • http://tebogekememesij.mygamesonline.org/myron_mixon_bbq_rub.pdf
    • https://cdn-cms.f-static.net/uploads/4379839/normal_604ec4e95ac40.pdf
    • http://terem.space/xapujazorubabuxosismm82j.pdf
    • http://ritual-venki.online/monster_2021_product_slatetm5ju.pdf
    • http://tiktokhd.design/47154276252twrjd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_4fdbe6e93dfd4baf89eb5e140dc8e75e.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_39992b7787c146779bd40850457c85ab.pdf?index=true
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_5c291435745f4f539c328346e8ff721c.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_10a86676ab6e4d67bd224f542bd48b4d.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/copper_sheet_weight_calculator.pdf
    • https://s3.amazonaws.com/lanubili/what_is_a_dual_piston_caliper.pdf
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_33ec5cf3bd3d4b4c88dbf64b3c4e8d89.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_off00010b73.bin
6fa1b4b3b3f059424773fb1235caa7da3830d4c9941575b69e8368583ee6bef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 5192 bytes
font_01_sfnt_off00011d15.bin
affa9ac8308570246678793a1dc08573857e6969328bb6e9963074bab7d43377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 11160 bytes

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