Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c15abe43ae9197…

MALICIOUS

PDF

84.4 KB Created: 2021-03-27 17:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3019972d568a7a8ce6ae703d33bb61dd SHA-1: bef5b3543ba2fde4580ad8e2038e684b3ec5e322 SHA-256: 04c15abe43ae9197146383e30ef20aaa303c4a0fd3bc77528fe6b5909bc2f792
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://kuzutuzo.ru/strik?utm_term=how+to+determine+electron+group+geometry', is directly associated with the malicious classification. The ML classifier and ClamAV also strongly indicate maliciousness, suggesting the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=how+to+determine+electron+group+geometry
    • http://silvanozito.online/god_of_carnage_theatre_royal_bath_review4cipk.pdf
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/2592154.pdf
    • http://premium-cinema.com/55211283588f496b.pdf
    • http://marafonsport.site/willy_wonka_and_the_chocolate_factory_scene_5w5fp7.pdf
    • http://shtampshop.ru/90081778027cprp5.pdf
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/mefuzopugema.pdf
    • http://lefuduzitenazig.22web.org/mail_merge_with_attachments_google_sheets_app.pdf
    • http://lazadacostumercenter.com/materials_and_metallurgical_engineering_book20w7b.pdf
    • http://detonic-italia.website/90469209561ft1ow.pdf
    • http://zoom-omsk.ru/cadre_photo_numerique_grand_formaty771b.pdf
    • http://eglo.club/what_to_do_when_you_are_unhappy_in_a_relationshipss97d.pdf
    • http://viewcreditscore.info/2005_nissan_pathfinder_serpentine_belt_replacement9ut3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xomudufe/is_there_a_food_processor_attachment_for_kitchenaid_mixer.pdf
    • https://s3.amazonaws.com/zarusegibitumet/fadabezibuwivon.pdf
    • https://s3.amazonaws.com/welanisowari/nibenes.pdf
    • https://s3.amazonaws.com/gezizefefififa/desi_desi_na_bolya_kar_ringtone.pdf
    • http://wafubarig.epizy.com/wow_8._2_leatherworking_leveling_guide.pdf
    • http://povuputuk.epizy.com/41752103380.pdf
    • https://s3.amazonaws.com/mixanaz/13647867028.pdf
    • https://s3.amazonaws.com/bajuse/75056366051.pdf
    • https://s3.amazonaws.com/lupebesu/44158653103.pdf
    • https://s3.amazonaws.com/tinezedu/nidijavavebizusawujizowa.pdf
    • https://s3.amazonaws.com/jagux/free_home_bookkeeping_software.pdf
    • https://s3.amazonaws.com/xisefowu/87943462527.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_off000108da.bin
fd9ee22e11ee67710bb577b546d56dbf36d4d169189a157e7b7c59da56d3269b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 5160 bytes
font_01_sfnt_off00011a6c.bin
e847c55f34b467f3a53a48b13c2623ab94b95216d2c928ec00a0c9b5d5eec561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11588 bytes

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