Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b89f2dd237db3ac…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 11:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 504d210af74e0d470c11c3eab37a6be0 SHA-1: b01c9e4a1163e5f17ba187f21d4a57577190cf8d SHA-256: 6b89f2dd237db3accbd015e4e9dfe4be256d19e2830cf9a54f84e9fbe8a2ff77
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or distribution mechanism. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=love+me+less+piano+sheet+music PDF link annotation
    • http://vegimawubukuwon.22web.org/55711434755.pdfIn PDF document text
    • http://bet-info.ru/brandon_bernard_last_words_full03vtf.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jpcQ0ge/color_fill_gun_with_nail_polish.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ejjM4e9/lipaz.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/vDgfwfX/kelley_blue_book_value_by_vin_number_rv.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/8hf3zeX/quia_rags_to_riches_context_clues_millionaire_game.pdfIn PDF document text
    • http://comforfemj.fun/15817859369zgp1q.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ibhaihc/xaxesonadurom.pdfIn PDF document text
    • http://esagafow.fun/first_alert_carbon_monoxide_alarm_keeps_beeping3bj5p.pdfIn PDF document text
    • http://vunijipejideg.22web.org/proform_995i_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/haQZwge/matlab_multiple_legends_loop.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/ifisfif/starbucks_drinks_2020_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/tQgjgd7/2543883449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367627/normal_5fe5383c5a8e7.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/CVgfXhf/94705279545.pdfIn PDF document text
    • http://zasasibibo.iblogger.org/51968941665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fe11636eb92f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_ca5b825fc0a244d89cf628b8b7009670.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_b8ab23eae2e34d60afd007915be5d0c9.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_c1ed05eb615745aba354b788bd2d9aaa.pdf?index=trueIn PDF document text
    • http://wapudajikipidem.epizy.com/xukulukajomibekuvubo.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_c39c0dfc00734577a4d537814daa560b.pdf?index=trueIn PDF document text
    • http://mirimanomuropa.rf.gd/gulewaruve.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5080 bytes
SHA-256: 8926d4009ed53a4845b40913c6da5bf9294f36cd6d5b0a329a4253b91b59adbc
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10420 bytes
SHA-256: caaf0d8c891e1d3d90fbb70dde3b55168d412d06e7037fe77c5e2ce050d1a8bd