Malicious PDF — malware analysis report

Static analysis result for SHA-256 65141ef2a54c8f9b…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 23:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 967e1cb01535ff0a4f065d8e3e093b4d SHA-1: 8167955eea479b5ce6d19fb2f399bb22a260575a SHA-256: 65141ef2a54c8f9b7d8d6fa605efb050b152613a5d25ed7431d78579259be921
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of generated links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/123?utm_term=battlelands+royale+pc+no
    • http://supermagazforsale1.xyz/how_to_calculate_maximum_allowable_stressarsyh.pdf
    • http://znasila.ru/how_to_reset_a_samsung_chromebook_to_factory_settingsli0as.pdf
    • https://wipumerafuzu.weebly.com/uploads/1/3/4/7/134729269/9077219.pdf
    • http://byt-upak.ru/zipawivovesiwajicfhvp.pdf
    • http://botavubapisod.mywebcommunity.org/how_much_is_a_battery_for_a_2015_toyota_camry.pdf
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/lebulepimizoxusive.pdf
    • http://hotsales-com.xyz/samsung_rfg298hdrs_ice_makerwyza4.pdf
    • http://potawuzaj.medianewsonline.com/37278844909.pdf
    • http://mosquito.codes/ms_project_2016_tutorial_for_beginners3c353.pdf
    • http://norikaloro.mywebcommunity.org/47601346232.pdf
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/fejiwizevu_woxawabezu_ribaxogexij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pimubejat.epizy.com/93090061208.pdf
    • https://s3.amazonaws.com/xovajukoxin/katesukavozeremifosi.pdf
    • https://s3.amazonaws.com/widiku/beats_solo_pro_wireless_noise_cancelling_on-ear_headphones.pdf
    • http://fipiravujed.epizy.com/niwatimugakub.pdf
    • https://s3.amazonaws.com/genedesowul/adventurers_league_season_9_player_s_guide.pdf
    • https://s3.amazonaws.com/vojapu/84959724751.pdf
    • https://s3.amazonaws.com/sugowubuf/happy_birthday_to_you_piano_sheet.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_off0000e47b.bin
66942c911b2401b61e5a59d6819ad476635fe63b768199ddcf978442705289e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5220 bytes
font_01_sfnt_off0000f651.bin
fc9977939a0c692b73675f21e07545c25644cd76fedc3010f045003579a22f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10260 bytes

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