Malicious PDF — malware analysis report

Static analysis result for SHA-256 42efd53dec81e330…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 01:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5cc9a08a6a42cef3284e6ebb13ca59d4 SHA-1: dc798093bc58981d7d089eb3aba489c790ca6c9f SHA-256: 42efd53dec81e330002541d5f93753117f800b0cca66e372156935a78ca7e7da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=batman+arkham+knight+official+guide+pdf, which is presented as a guide for a video game. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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.
  • 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://mezovuduw.ru/award?keyword=batman+arkham+knight+official+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/wigatozaduw/ioXghGg/9th_class_ki_tc_application.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/wyhaD8c/zuru_x_shot_bullets_compatible_with_nerf.pdfIn PDF document text
    • https://doxabonejanowi.weebly.com/uploads/1/3/4/6/134669922/jujali-zizoju-wejatav-bugozumebew.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/ijeGopX/38709775152.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/gapovotiwifefam-nunopilanovuw-lefogixuwezaz.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/195923fca6a.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/4869814.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/rukaxosotutefobefof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xabalaru/54544207980.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/does_osha_cover_residential_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b115d8-8dc6-40e3-8929-90d2b9435d78/what_is_the_danger_zone_for_food_temperatures.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/grad_gress_words.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/text_to_image_generator_github.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/98584280938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2111d8-2dbd-48b1-b3ff-fe45b9a73291/95260612418.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/89495728080.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/thank_you_letter_post_interview_template.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/jazz_bass_guitar_method.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/64451131131.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/50760663655.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/41775275888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd3b64d-5e38-4a3f-bd4c-ac2a259ed696/chess_opening_repertoire_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/corbettmaths_exam_style_questions_probability_answers.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_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 5388 bytes
SHA-256: d5bea41c517cf96ffe2d4c280c662ed62cdcb2660559da3328e2c7ee281766a0
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 10260 bytes
SHA-256: eb0e6a83f95c0491a4557ad6df49d8d09a7325f3aaba59fb78f7f392de6d6c65
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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