Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e246d3f6a2384c9…

MALICIOUS

PDF

70.9 KB Created: 2021-04-14 20:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9de072d32f0bde3a66b16110e831fc8 SHA-1: 14f2a2bb4a833a19850ac791e81f258ec9510a02 SHA-256: 2e246d3f6a2384c983a8d04e58a940cd3b22e3c8c22243870647c11002e7ffc6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URLs, with a primary focus on `https://zajinet.ru/strik?utm_term=edexcel+a+level+biology+book+download`, suggesting a phishing or content-luring attack. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users.

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://zajinet.ru/strik?utm_term=edexcel+a+level+biology+book+download
    • https://cdn.sqhk.co/rivitovolu/8cVmict/98658261501.pdf
    • https://cdn.sqhk.co/vijamabaf/thagjAc/18671458354.pdf
    • http://biwadevebudorif.22web.org/18030276038.pdf
    • http://rowaxamapitowej.getenjoyment.net/vibexixatesawusel.pdf
    • http://gajaxujifusokul.mygamesonline.org/indian_veg_sabji_recipe_in_hindi.pdf
    • http://tisimewifexumi.iblogger.org/67564774392.pdf
    • https://cdn.sqhk.co/worijekegir/hp3dhem/50513352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zazisuj.epizy.com/elijah_and_the_widow_coloring_sheet.pdf
    • https://s3.amazonaws.com/miledu/toro_20334_engine_parts.pdf
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_a6ef50a95d5b4f67bf05503d97294031.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/crusader_kings_2_strategy_guide.pdf
    • http://kuxemozoxabonag.onlinewebshop.net/cambridge_pet_vocabulary_exercises.pdf
    • https://s3.amazonaws.com/widiku/seek_and_destroy_pc_game.pdf
    • https://s3.amazonaws.com/zafijukopa/scientific_calculator_pro_apk.pdf
    • http://xabudavadeguvo.myartsonline.com/xetavokubokebezubesa.pdf
    • https://s3.amazonaws.com/pidufozu/cia_internet_security_firewall_apk.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_deb7285fb6284e31b85410e5eb925285.pdf?index=true
    • https://s3.amazonaws.com/pukaridimupo/apologetica_cristiana.pdf
    • 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_off0000d4b6.bin
82b348210c90bfa58f2a1aa2401ab0b06f135e14a578100c30e460b9b2bf6e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 5316 bytes
font_01_sfnt_off0000e702.bin
98ac7f489460f5c388a323e0594c02c1cb3059b2d719727362899158510a06cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 11696 bytes

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