Malicious PDF — malware analysis report

Static analysis result for SHA-256 961f6ebb868c9432…

MALICIOUS

PDF

78.2 KB Created: 2021-02-27 13:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 632fbd9589b6124ea75faf8b149b0613 SHA-1: 17490feec152753748e641babfc582c308249f2a SHA-256: 961f6ebb868c9432785d98cfef5e72d97204ffc8e488a52ccdebd17c3aa88929
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious content.

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://xajibur.ru/strik?utm_term=irobot+roomba+670+robot+vacuum+r670 PDF link annotation
    • http://indir-kazan.com/zibopurujopojonapfnry4.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/hEjhrgh/shooting_commando_elite_mission_free_fps_games.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/6984399.pdfIn PDF document text
    • http://mydenverneighborhoods.com/tovoladasusakijixazuglad.pdfIn PDF document text
    • http://smartycredit.info/voxerepawoaiief.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/tikirurubelitovakutuuxtw2.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/daxiludabagow.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/IdBgdje/globe_at_home_admin_password_generator.pdfIn PDF document text
    • http://a-trvl.ru/52715126207jqxpf.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/CxPIgij/parkour_flight_2_apk_download.pdfIn PDF document text
    • http://coloradocustomelectric.com/genipajululegu0t62.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ggSibZf/new_photo_editor_online_2020.pdfIn PDF document text
    • http://lasleymarkt.ru/3d_drag_racer_v4_hackedw7r9x.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/p6ge2ju/go_on_view_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/iclif0I/dune_1984_full_movie_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/cXdrUjb/hero_of_archery_idle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/jfai5Lh/32550684588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 5248 bytes
SHA-256: c6dec9c4a797b2a9e87b5e973f933e1a85a344600ce3eae3557cb2855bf6b5e8
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10576 bytes
SHA-256: ceaf47d74facde9d5a6f856ace907291c84b20156a73eed8876252ebacc779c6

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