Malicious PDF — malware analysis report

Static analysis result for SHA-256 2486ff654ca5c238…

MALICIOUS

PDF

75.4 KB Created: 2021-04-17 23:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2934e51c0be4d787664de0dcc2ebec4f SHA-1: b008a230e6afe7a268c007c9342c60b190df8917 SHA-256: 2486ff654ca5c23897774429b4ed8b5d0cce8652e435297d7abb6fcede79ff71
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier strongly indicated maliciousness, and heuristics identified the document as a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=netgear+fvs318n+firmware+download In PDF document text
    • https://cdn.sqhk.co/desiketomasu/ihagfij/derelefanirozolumumuba.pdfIn PDF document text
    • http://biweekamnf.com/gibodevorojogevomotok5l7j2.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/DUOHbjg/detective_baldy_apk.pdfIn PDF document text
    • http://sarhello.online/bamudibevazadomovityu5dq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_601228abe6b1a.pdfIn PDF document text
    • http://blubadgehelp.net/pujexirevavowoxaguviju99y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6063ebbb793b5.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/gfwajeo/supplementary_angles_calculator_degrees_minutes_and_seconds.pdfIn PDF document text
    • http://reawont.online/org_chart_template_powerpoint_2016c7bdb.pdfIn PDF document text
    • http://vovality.club/jobimugipizisemonis2w7xt.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/mirexotadaboy5y62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5ff64a6d76d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_604dc7abc0494.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/Ghjjh30/crashing_season_3_episode_8.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/Uhi6m5Q/kubivodijafetuwonat.pdfIn PDF document text
    • http://remont-pc.website/decimal_tenths_number_line_worksheetswi0gk.pdfIn PDF document text
    • http://rabota-plus.club/fizumujy8xpf.pdfIn PDF document text
    • http://gprofights.ru/jumpers_knee_pain_at_nightmkujk.pdfIn PDF document text
    • http://prizinsta.online/jepenie3te.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6033b029f3481.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/01f65376-86f7-4857-995d-9afcb6e43384/fundamentals_of_heat_and_mass_transfer_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f9de1e-d716-4fc4-bdd1-9783ce89fe34/wofikutesugededuz.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5756 bytes
SHA-256: 4f6e0361237a38ad5a3bbc72d9b9cf5d08313843a15b02fc2b9670faf6d2099a
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 11124 bytes
SHA-256: bffd7677365e7508606a35ffb892b2b36ea59646cde44ca2bc1d15d0a490a603

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