Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c4f638ebe1e735…

MALICIOUS

PDF

79.6 KB Created: 2021-04-29 19:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 91cfe702a927cdbf253cb7c021e06ea6 SHA-1: 5913a35d4a5c8a0de85c3ceab7aa48be21b74870 SHA-256: a9c4f638ebe1e73556e8ef599c9a3a839c4550cebe235408f2234a4091139213
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, suggesting a link farm designed to redirect users. One prominent URL, 'https://nipisod.ru/strik?utm_term=my+garmin+gps+will+not+hold+a+charge', appears to be a lure for users searching for technical support. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=my+garmin+gps+will+not+hold+a+charge PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fef6b7877236.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/3db7c13.pdfIn PDF document text
    • http://wujukoje.iblogger.org/58321468722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5fcace08f3d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_600dece1008be.pdfIn PDF document text
    • http://rinevagisovagi.22web.org/can_i_teach_myself_transcendental_meditation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_605d4ea198f0a.pdfIn PDF document text
    • http://xenifizonuk.22web.org/europa_report_2013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6036b24d3016d.pdfIn PDF document text
    • https://xetiwomojebiwif.weebly.com/uploads/1/3/4/7/134714835/4284f3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/why_are_old_airstreams_so_expensive.pdfIn PDF document text
    • http://putesedesupelo.epizy.com/development_plan_template_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1c24c1-2c61-40e2-8797-04426c2ea890/luwarakodaxulaluz.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/explosion_box_design_template.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/peters_spelling_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aa16d9-3fb5-49c4-8591-df0560440c88/kijopedaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae906b2e-ff5f-4917-92d6-b8c017ce53bd/windows_batch_for_loop_command_output.pdfIn PDF document text
    • http://medexode.atwebpages.com/computer_hardware_definition_in_hindi.pdfIn PDF document text
    • http://nubijusumodas.rf.gd/agile_principles_and_mindset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42aabc74-5c15-4691-b014-4a2f3801c979/50760667190.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 5476 bytes
SHA-256: d9d5a6a325101b4464e24dbb0973a689ea3b56ee9314e77a25e56b4cd54c202e
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 11336 bytes
SHA-256: 566de2a9bfbd88ace6ca27755184fa5c813665779228efeb5d07a66bfc989f01
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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