Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ee84c867a2ed7c…

MALICIOUS

PDF

86.0 KB Created: 2021-04-12 10:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b2b58e83f9e0f1bbae96ef228a212e8 SHA-1: 86d82cf8972e8715102b7ba1a0b06b7a78a53a08 SHA-256: 44ee84c867a2ed7ced1b51ea992edc9e44e766798d5407c52cc955f03dfb08ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://zajinet.ru/strik?utm_term=what+does+peptides+and+collagen+do+for+your+body
    • https://cdn.sqhk.co/guzikiku/FR948ie/pac-_man_world_rally_ps4.pdf
    • http://kilijosizujowo.medianewsonline.com/curse_of_strahd_reloaded_amber_temple.pdf
    • https://cdn.sqhk.co/zawukomofise/ibIvghd/ortel_mobile_app_iphone.pdf
    • http://burrrhey.tech/rosemount_3051_dp_transmitter_accuracys8dbo.pdf
    • http://giftcard-sale.store/the_fall_of_the_house_of_usher9db50.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/nordictrack_x7i_incline.pdf
    • http://fherixq.com/how_to_program_genie_intellicode_garage_door_openersadyi.pdf
    • http://com-connexion.xyz/984784986689x9jf.pdf
    • https://cdn.sqhk.co/loxowopiv/Mjjjjha/nixeterupaxojorup.pdf
    • http://zuxekagapefe.mygamesonline.org/physical_science_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wusone/tefulozowejunuse.pdf
    • https://uploads.strikinglycdn.com/files/3f1c9b55-8160-4670-a053-f932fc829e75/what_is_a_normal_2_year_old_temp.pdf
    • https://uploads.strikinglycdn.com/files/64ee4a7b-4633-48ed-8962-c16ceabfe713/vokogulevezodiresujiv.pdf
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_09316d4e32da49598743b17d996bb95f.pdf?index=true
    • https://s3.amazonaws.com/rupatojuko/sefojazimifikumusujer.pdf
    • https://s3.amazonaws.com/wizitifowubux/king_size_bed_sheets_for_thick_mattresses.pdf
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_ea7f0c8256044d009f0296ad579b8884.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001102b.bin
3c78378966eff082c518691154e16ba1b91aa340abc084851c38ead1a7e1c8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 5672 bytes
font_01_sfnt_off00012384.bin
3227ae15d552389db72be25d210ed44e8056684dc5f3518770c495fd603cd913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 10968 bytes

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