Malicious PDF — malware analysis report

Static analysis result for SHA-256 6349954e14fa24f7…

MALICIOUS

PDF

73.1 KB Created: 2021-04-07 05:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af2b67bf3792d288f17a63d335706192 SHA-1: 90edcfd50dba9c727f067f7bb54cb81c413f39d1 SHA-256: 6349954e14fa24f7b708d98f477746c167d34e4621c9f6b676c3e3199f3ba711
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=strong+spas+durasport+reviews PDF link annotation
    • http://obsluzhivanie-kompyuterov.moscow/android_studio_button_change_color_on_clickj2q2t.pdfIn PDF document text
    • http://itali-big.space/bitenofukiderikelakuzegypps3.pdfIn PDF document text
    • http://iuts.space/mx_player_codec_armv7_neon_downloadbax1p.pdfIn PDF document text
    • http://zipufofofize.22web.org/42741778101.pdfIn PDF document text
    • http://omerkatanalp.com/28740763087sdvtd.pdfIn PDF document text
    • http://zexedebamuwep.iblogger.org/95759282751.pdfIn PDF document text
    • http://blubadgehelp.net/39664057153oj9vx.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/6362448.pdfIn PDF document text
    • http://losinglotterynumbers.com/811019559275ylj1.pdfIn PDF document text
    • http://paktum.pro/emotional_videos_for_whatsapp_freeau7ul.pdfIn PDF document text
    • http://feelslike35.com/hoover_steam_mop_twintank_stick_steam_cleaner_wh20200dbe8b.pdfIn PDF document text
    • https://bobebizup.weebly.com/uploads/1/3/1/3/131381471/710752.pdfIn PDF document text
    • http://itali-big.space/kubota_bx25_bx23_specsj2iy6.pdfIn PDF document text
    • http://fc-aromat.ru/razor_e200_electric_scooter_top_speed21xbt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a7b6b8-76d2-4d26-8c15-2cff0a9150ce/56441538082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e1fda5-eb7c-4014-b1ec-f775bdd180b0/map_skills_worksheets_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 5352 bytes
SHA-256: e78600f3f06ef6a78bbce6d3b9f0cdaefb6104e597be40f54b33d8438936eda1
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 11052 bytes
SHA-256: b530a6e76b32201391d1899598f239659dfa414f6921cda87ff0deb7b18eb45c