Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f21cb1d4e4436c…

MALICIOUS

PDF

83.3 KB Created: 2021-03-10 14:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 69d7ec82b2229f408ebb08835edaa0d6 SHA-1: d1ff50ed15d165c5c952e861b8386c00436349d5 SHA-256: 93f21cb1d4e4436cfe411fb5594d8629b97ead4d994a16dbd857be8a39b36325
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, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to redirect users to potentially harmful sites, likely as part of a spearphishing campaign.

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://soxebez.ru/123?utm_term=desynth+guide+ff14 PDF link annotation
    • https://cdn.sqhk.co/sezogitov/aieihjj/97537973597.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/Qheichg/hangouts_meet_app_download_for_mac.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/69588175079.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/jFhehj3/the_walking_dead_season_2_important_choices.pdfIn PDF document text
    • http://wei-nmvc.com/vefubizegesovafafomepataspb8i3.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/what_are_the_duties_of_an_aircraft_mechanic.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/89661122748.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/d8uZiaY/24380312978.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/hdgcIUK/zowekutir.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/wigefowenibawos.pdfIn PDF document text
    • http://taptopbot.com/free_stream_overlays_templatel98ka.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/76691864403.pdfIn PDF document text
    • http://dle-tpl.site/369021182287qj89.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/where_can_i_purchase_a_metal_detector.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/e22henY/stack_it_peg_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuxinekowa/hji9jhj/appalachian_trail_hiking_guide_book.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/blank_bill_of_sale_for_car.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/af302aa2-1be7-4b5e-8e0e-307daf8d8f08/english_literature_authors_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20baeb9a-2812-4753-9543-e57bc2da4734/panigakekakexibipulimax.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/jijodunoxijonojima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a5bc8e-cd64-43b6-92c2-65db6e55858a/xatazobibonupubekepu.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_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 5072 bytes
SHA-256: 507120702326a3a6dd2a22ecc71288069b178083910e8221d04c40d78a48e790
font_01_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11260 bytes
SHA-256: e37036a16fdc1ff34e5bd0eaefdc5d24ad89c7afb2583d951321863652c83820

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