Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb010c7c1a527b67…

MALICIOUS

PDF

85.5 KB Created: 2021-03-06 13:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec55e6552c651eed8aead414d13c6353 SHA-1: 2fcfa4640a3c589eec756920a5887c4665738d7e SHA-256: cb010c7c1a527b6791dbffe4f2a092a5896f5e66c02e44b53e14ca197854c498
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://leonvi.ru/wix?keyword=how+to+get+free+spins+on+coin+master+2020+ios
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/kukezibe.pdf
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/sujazasux-werep.pdf
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/tinen-lidakokapa.pdf
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/fulomez-wurofitej-fasalefodamuda.pdf
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/1089451.pdf
    • http://bikejesoxatelo.mygamesonline.org/best_dance_music_in_2020.pdf
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/ragubimavid-gurakarok-fuloxatixowuwo.pdf
    • http://fanilobepewe.sportsontheweb.net/philips_avent_electric_3-in-1_steam_steriliser_scf284_01.pdf
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/ce0a1d3f114.pdf
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/8332095.pdf
    • http://zutolewe.mywebcommunity.org/how_to_multiply_in_expanded_form.pdf
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/450647.pdf
    • http://bibivire.mygamesonline.org/5_love_languages_quiz_30_questions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_061982bbefea4882891cad746ce066fb.pdf?index=true
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_a1cb2721e9524c86aae7758a73de761f.pdf?index=true
    • http://gosaduzunake.myartsonline.com/how_to_stretch_for_plantar_fasciitis.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_dffa2dbe544a43148f8173e3737887a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/647d6693-3099-4974-8b7f-205fa93a96de/arduino_mega_2560_pinout_pwm.pdf
    • https://uploads.strikinglycdn.com/files/a93b2f09-f55a-490d-9d4e-5e5ba9a0777f/lupovumifigu.pdf
    • https://uploads.strikinglycdn.com/files/851d7c20-910b-47cf-8975-62cf30ceaec5/46833975697.pdf
    • https://uploads.strikinglycdn.com/files/f254c71d-dd51-454f-9d9c-a04fff349ae5/free_propresenter_backgrounds_motion.pdf
    • https://uploads.strikinglycdn.com/files/4549e8a4-7aae-4c65-a6d2-ced071b408a7/xogumur.pdf
    • https://uploads.strikinglycdn.com/files/64f7de7c-4545-4f4f-8667-f16dde9c8e2e/kiberomedinine.pdf
    • https://uploads.strikinglycdn.com/files/6c1cda1b-1cfe-42cc-8b30-0b75a7598742/the_idiot_book_amazon.pdf
    • https://uploads.strikinglycdn.com/files/05262aa7-939a-47d2-930d-4f086425f0f3/zurumavutidigofedemepal.pdf
    • https://uploads.strikinglycdn.com/files/b5749182-8aa8-4d2d-b497-0d187f3c3620/dumowu.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_off00010d9e.bin
981883eee6841798a1d98b4d4ec499b39a468b53898e24e1c00d16633b0c01a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 5628 bytes
font_01_sfnt_off000120d3.bin
2c4a0388ab664a5ded6fef18a7ecc6283cce7abad427045730006af50905f45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 12416 bytes

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