Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d80546c4423330f…

MALICIOUS

PDF

95.7 KB Created: 2021-03-10 11:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 16b4d406d65dd0d8648d193588c83d4c SHA-1: ce2b523966b0837f28802d2f38c8373e13f5ca9e SHA-256: 8d80546c4423330f698458016fba1b965c069842f2f47704a62a92471716a817
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=brahmanic+and+shramanic+pdf PDF link annotation
    • http://wide-mean.top/4287056434tgu4o.pdfIn PDF document text
    • http://devlp.design/audio-technica_at-lp60xusb_fully_automatic_belt-drive_usb_turntable_reviewuhxu8.pdfIn PDF document text
    • http://comforfemj.fun/zobaxevukumj79j.pdfIn PDF document text
    • http://probmaka.tech/vugixonafezutonuaih72.pdfIn PDF document text
    • http://lnstagramsecurity.net/how_to_use_sd_card_samsung_tab_a5dp5s.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/71216375640w9322.pdfIn PDF document text
    • http://gofipupeseg.22web.org/corazon_ang_unang_aswang_free_movie.pdfIn PDF document text
    • http://fastdonwload.space/infection_control_guidelines_nhs0atx9.pdfIn PDF document text
    • http://theandyhong.com/40678887766ap1fu.pdfIn PDF document text
    • http://contarinihome.com/91541785710q7yj9.pdfIn PDF document text
    • http://daliadiago.com/epic_games_support_refund6mrm7.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/ludigapakazofevivepurevoliza70.pdfIn PDF document text
    • http://fitokapss.xyz/how_to_critique_a_stage_play_evolve24nno.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/0e2d0fcc-8e3d-4845-8955-f67b3e1eff62/mogixodozojosefasod.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_a86479f7d04a4e2c89962ee3f5fb0308.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc637d4-4504-4e89-ad64-62d96154ba34/73436005880.pdfIn PDF document text
    • http://narajogevimoxe.epizy.com/dynasty_legends_guide.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_b75cf6ad34124ddb94ae9c1c7324924c.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_ce2ee0abf37e4ed7b04e032d3595543a.pdf?index=trueIn 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_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 5412 bytes
SHA-256: a6175097a5111383e4dfca1b51f5c2d898b689bf9fd5d27071c3a4285a8d3d70
font_01_sfnt_off00014e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E69 10504 bytes
SHA-256: afd6524e2b25c1955468043631746e00847652406d52281946ab1614201dd58d

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