Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5437a2bb20d18a1…

MALICIOUS

PDF

71.5 KB Created: 2021-05-22 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56add61316c818a7d4c13e2a438add1e SHA-1: a9e0921882ebcde3a7cf88324da303e6843e6957 SHA-256: b5437a2bb20d18a1702b1be286d5968d48b20bf33d978c23ae109d50edb3a6ab
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru/strik', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Super start power pack how to charge'. No scripts were extracted, but the PDF structure and URI suggest it's designed to redirect users to a malicious site.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=super+start+power+pack+how+to+charge
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fc5bb79685e4.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_603e7ab33ef71.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fd28aeb80733.pdf
    • https://jijexibubiv.weebly.com/uploads/1/3/4/6/134635554/9801336.pdf
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18c252c567.pdf
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/809976.pdf
    • https://cdn-cms.f-static.net/uploads/4470387/normal_6035efc0386c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/383663f5-3584-4c42-aa16-70075d0064a1/12940812305.pdf
    • https://s3.amazonaws.com/tobito/20159077859.pdf
    • https://s3.amazonaws.com/tupofelasujewas/55030532640.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/division_with_remainders_worksheets_for_4th_grade.pdf
    • https://s3.amazonaws.com/fobupojowojon/vpn_master_android_free.pdf
    • https://s3.amazonaws.com/tipikaxe/kasixutibonusovixup.pdf
    • https://s3.amazonaws.com/vogubivajavofu/paraki.pdf
    • https://s3.amazonaws.com/mupukesunobaga/bob_revolution_flex_3.0_jogging_stroller_graphite_black_old_version.pdf
    • https://uploads.strikinglycdn.com/files/45d23da5-00f4-4d51-bb3b-d64ea7a9eef7/xeruwo.pdf
    • https://uploads.strikinglycdn.com/files/4373c182-5033-4f1f-ac79-cad264dbda27/veg_recipes_for_dinner_indian.pdf
    • https://www.harborfreight.com/3-in-1-portable-
    • 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_off0000d8dc.bin
0cb6a2625f8ebfc71cdf2647b4c8401470820a9dcb9b13508e786e54d099be0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 5420 bytes
font_01_sfnt_off0000eb5d.bin
664d5bd4fa526f1be1f1f8ef3233f2c61e3d1175456f042d0a9f71b86a1385f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 11120 bytes

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