Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc5cdb5ae01b3ba…

MALICIOUS

PDF

164.4 KB Created: 2021-04-04 03:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cc059899ea510cd268c33d7caf1dceb SHA-1: 6bc5480aa140a9108ad24bcb4dd7c93365b7ec90 SHA-256: fdc5cdb5ae01b3bab043aaccbdd6431e050d945e5f2d8935578042277fc2ce22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the primary URL. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+is+30+for+30 PDF link annotation
    • http://obschee.xyz/international_day_of_the_girl_2019_hashtaglp200.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/YjjuWie/frases_tumblr_en_ingles_sad.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/XigHTgc/4fun_app_video_status.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/fWStK1R/talk_home_international_call_rates.pdfIn PDF document text
    • http://vsspb.ru/barbie_tingz_mp4g8emr.pdfIn PDF document text
    • http://nuzikukobusan.iblogger.org/td_jakes_books_on_marriage.pdfIn PDF document text
    • http://yesstore.pro/wejupowifuxe1vra0.pdfIn PDF document text
    • http://xeresorejal.iblogger.org/alter_ego_b2_guide_pedagogique.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_05dfe4dd74fe49b0866e2013b92cbab8.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_d5bc7b550595478fb302a6e662cc6caf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c785c1-86b1-425b-a427-174952ed62ce/suntrust_bank_locations_in_virginia.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_23fe17cdda9d4170a2ad5ac85e5ec20d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8289b6-ae50-4701-9357-eb3e3126e51d/liftmaster_security_972_lm_how_to_program_another_remote.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_f311975cdcdb43eb91056dda5824f8f8.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_dcd1e0966b394da885a82916d6feaba9.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_db0793b45b62403ea9b3ce801dd0686e.pdf?index=trueIn 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_off00024724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24724 5140 bytes
SHA-256: b6d2e7b7137c16d5247e537f71ed31c5c9db0a6321457eec827985cde432be01
font_01_sfnt_off000258a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258A5 13692 bytes
SHA-256: 91c364a3562b26c153c72ceae1e441a274c77423a59c547fb994bb6895ba43eb

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