Malicious PDF — malware analysis report

Static analysis result for SHA-256 8641bd8c22b6653d…

MALICIOUS

PDF

76.9 KB Created: 2021-04-16 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c9edf333de5c5422ef542deec12c7990 SHA-1: 9a4f192416bea8d99ccc29867e6aa25fcb4c71f6 SHA-256: 8641bd8c22b6653df4bc7a222c4a471eaefd743ed83b138b216178e86eb01703
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence point towards malicious intent, likely involving redirection to phishing sites or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=international+journal+of+medical+science+in+clinical+research+and+review+impact+factor PDF link annotation
    • https://cdn.sqhk.co/zuvezunotumu/gexjdgh/famixurarirojunepufade.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/igijc2t/48013305184.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/ompn8ig/vanetanedupa.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/hdgDOR6/3694807865.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jeiibhd/pexutumavowoninox.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/jgdQgh7/megabus_tickets_to_houston.pdfIn PDF document text
    • http://craftsmansmetics.com/zutodotinonavujfnuz.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/85424550014.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/cdU0iZB/28264880141.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/giaagh1/rovanizumakoxilevebageki.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/48959368641.pdfIn PDF document text
    • http://fakaripeti.xyz/carbon_cycle_gizmo_answersl2d1o.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/31216445346.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/jgJoidq/kaxigerijigamovugopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/photoshop_invitation_card_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c4ac73-bf66-4ccc-869f-988c96211ace/73446155328.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/87626881645.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/13749396522.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/wavolatasimepodulosineme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03cc39a-0a97-4a69-8426-84b21f36058d/no_539_my_mary_poppins_minimal_movie_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6dbc67-2da5-408e-a935-161f31c97e21/wopumimavatudesufewuvadu.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/ffxiv_innocence_guide_normal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fc26dc-ea9c-4eda-aead-882a3e6a4e2c/gimib.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5560 bytes
SHA-256: ed346f63397904baef4481058b4e2d5924e0c872c4b4416d7e2c64be86336132
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 11388 bytes
SHA-256: 619f193817fd76ccad5cd14a664e40fca728cd0aaedfdfd4961becb1f964fa07

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