Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b3ae8985872707…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 18:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a8bfd41ef9e5448d6b7b1c49bf8f52 SHA-1: 297beb8c761c7d1011d807aacbc51bb1e3d629c8 SHA-256: 22b3ae898587270740d282032751f20d73c7b7f7cd268dfda239700ae702e687
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'vilenefex.ru/award', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a lure to a malicious site, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=frases+comunes+en+ingles+y+espa%25C3%25B1ol+pdf
    • http://pannochki-art.com/numowidademolafavogokikup581e.pdf
    • https://cdn.sqhk.co/matezafun/3vhbq6O/6502828188.pdf
    • https://cdn.sqhk.co/xizefonuma/Bergc50/nba2k20_locker_codes_that_never_expire.pdf
    • https://lolifibek.weebly.com/uploads/1/3/4/6/134634661/nofuzubajofajom.pdf
    • http://kelnoteres.xyz/college_physics_serway_11th_edition_ebook7xwml.pdf
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/877935.pdf
    • http://reduslimitaly-ufficiale.website/intel_corporate_brand_identity_guidelines5gwsq.pdf
    • http://wide-do.top/amaze_file_manager_free3iwvi.pdf
    • https://rodubimalutavos.weebly.com/uploads/1/3/2/6/132695690/4001448407a4a1.pdf
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/4d97e546153.pdf
    • https://cdn.sqhk.co/govizanorev/f4ic82o/dragon_ball_z_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/gijosevozu/MMiehcr/ice_cream_places_open_near_me_on_thanksgiving.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/18e0f207-5374-47fe-b964-26457dd00a53/detifovideroxudunotibirit.pdf
    • https://uploads.strikinglycdn.com/files/3f2fa3df-7326-4b9a-a201-fb62e6a01771/classify_antibiotics_on_their_mode_of_action.pdf
    • https://s3.amazonaws.com/jikopot/zagita.pdf
    • https://uploads.strikinglycdn.com/files/3d5de101-97fd-4929-9c4d-ab7d38e4af46/1000_places_to_see_before_you_die_ebook_free_download.pdf
    • https://s3.amazonaws.com/wemazun/dufon.pdf
    • https://uploads.strikinglycdn.com/files/b4530455-8e5c-4977-a8e6-563b88fce755/hp_officejet_4500_desktop_printer_manual.pdf
    • https://uploads.strikinglycdn.com/files/7b3d8120-64f1-4579-b005-703735b88e87/ximomiviwegun.pdf
    • https://s3.amazonaws.com/povelenavuviw/husqvarna_55_rancher_carb_adjustment.pdf
    • https://s3.amazonaws.com/ginutu/42346482608.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb94.bin
9009325d1abc0f4ff50833bba39400565b116e18476f8b808c0e933494bc1445		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5548 bytes
font_01_sfnt_off0000fe0d.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 1800 bytes
font_02_sfnt_off0001069b.bin
6d0bd79d267835fbc61fb541dd1ca5fffcdebc48c06656674958d6544ff22f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 12024 bytes
font_03_sfnt_off00012db5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 4324 bytes

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