Malicious PDF — malware analysis report

Static analysis result for SHA-256 5026dd300b83f7c3…

MALICIOUS

PDF

79.0 KB Created: 2021-05-11 06:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7a566f09312b6629854c7e3792948878 SHA-1: 928d6a02e257694620f5b573c5140c2d08fc82f7 SHA-256: 5026dd300b83f7c3ec0efcf106f655d75225e319459f9ff33d03d2924a6ce19c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=what+does+a+neuropsychological+test+show PDF link annotation
    • http://wei-nmvc.com/mercruiser_3.0_tks_repair_manualn72km.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/cEgi7gg/bingo_at_home_app_points.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ifEkgi2/bajan_marketplace_appliances.pdfIn PDF document text
    • http://housefashion.ru/how_to_make_a_video_with_talking_animals8qho4.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/64c17.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/c9VK3ih/35084334444.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/qjgcS42/dragon_warrior_3_chance_spell.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/crer_un_compte_explora_parkd4dkx.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/9243303.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofeparulofiz.rf.gd/sifuzura.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/18325588024.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/wow_inscription_guide_bfa.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/totutalelapusovivana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b308ecf-bad2-4da9-ac25-fe6cc0a10b85/how_do_i_schedule_a_tattoo_appointment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078196bf-d75d-4f77-b130-aaa0c4764a8e/gadofip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474bb12b-830b-43c7-acc8-6cd1251de00e/is_all_ram_compatible_with_ryzen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce01acb-4026-4b27-86ae-3b429fd2c2f4/ethical_hacking_training_institute_in_mumbai.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/jagelowiw.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_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 5540 bytes
SHA-256: cb72dcb82fb98f36e34a12cb7d0bad04eebca537deaeb7437c3b7f40ae9bd2fd
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10440 bytes
SHA-256: 23554426d0eff05aa579582addb5add6deb50d30d817302216275a594576f3bb

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