Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c48b26ec7f87d5…

MALICIOUS

PDF

77.0 KB Created: 2021-04-04 20:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a73f24764088c37b123a1f121da557bc SHA-1: 20ed36defba38e936aa89db7a8da52fc36b535e5 SHA-256: 24c48b26ec7f87d5d9619f374982aaaf98e33129bac96bff110a8876a56b0732
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'conflict resolution strategies for students'.

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://resalured.ru/strik?utm_term=conflict+resolution+strategies+for+students PDF link annotation
    • https://cdn.sqhk.co/lufasawo/jBFgfai/99766406599.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/gg2ihjh/78327909296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fc9cf43d54a1.pdfIn PDF document text
    • http://pepopaguwanutet.22web.org/gross_anatomy_of_the_heart_worksheet.pdfIn PDF document text
    • https://xobijetulotifo.weebly.com/uploads/1/3/4/2/134234675/988596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_6007d7e818ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_6027741edf670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_605c673130fda.pdfIn PDF document text
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/butuvujukane_wimibanaz_giroxoda.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/2bfd1a32-37a6-4cf5-aa8a-082c8b19d141/the_monkey_king_movie.pdfIn PDF document text
    • http://kosener.epizy.com/74593060080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529afccd-5e74-4bf3-a4fb-fdfce4b6ce01/what_is_the_master_cleanse_diet_instructions.pdfIn PDF document text
    • http://dovevane.epizy.com/peavey_vypyr_vip_3_bass_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/pewter_report_tampa_bay_buccaneers.pdfIn PDF document text
    • http://vebilotavofako.rf.gd/sibajigidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb2a449-4dc9-4db4-a891-83f231e3ccd3/angela_davis_are_prisons_obsolete_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/5200254428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf424b43-78b4-44e0-ab6a-91b670fe7808/fallout_4_mods_pc_installation_guide.pdfIn PDF document text
    • http://zibuvovod.rf.gd/83130802505.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5092 bytes
SHA-256: 3f6eeb2f47ef1bdf6552dc0a1c14bca99ec75488fe1286489ed32bb69e491733
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10760 bytes
SHA-256: a3a9c38b5fdc67d49a6631b66dd1a922b122dda1cad3ebb54ae9b8441e23697f

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