Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b90ec6f2038cd9…

MALICIOUS

PDF

77.7 KB Created: 2021-04-07 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41159a379b3be6e44f4cd1d9f1ec6d34 SHA-1: b0b2bf22904fa64954c857f6e0c2167ea646e9be SHA-256: 36b90ec6f2038cd9e46ea82df3391b31f1718e5e12bfee4df8a3feaa047d9f61
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=cards+against+humanity+online+group+play PDF link annotation
    • http://bestunew.xyz/structures_or_why_things_dont_fall_down_wiki7cyd2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://golosa-spasibo.ru/kugilarabesuzx4n1f.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/gdjd8Sk/mk11_kombat_league_skins_leaked.pdfIn PDF document text
    • http://life50it.pro/emergency_medicine_physician_jobs_austin_texaseul9c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/tmwvTid/28521627759.pdfIn PDF document text
    • http://ilkertr.shop/natonui5dd8.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/77815595061.pdfIn PDF document text
    • http://dkmz3.club/bare_knuckle_fighting_resultsulof2.pdfIn PDF document text
    • http://kupiokno.su/28114424913sneju.pdfIn PDF document text
    • http://ch-redirect.icu/94916883208jethg.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/UdDcDjh/39187754188.pdfIn PDF document text
    • http://caterm.ru/pezobubepedu8jg.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/mathematics_in_the_modern_world_file.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/czardas_trombone_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hCif2jh/ancient_rome_warm_up_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_237b686feadd494c874b1904b47edec1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c91148-afd9-41f1-a72e-35216182c999/word_for_monstrous_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2307fe-bfe4-4d3d-895e-280bd3d0ee13/mavanurubijigirowedimoj.pdfIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_13902992fe374d9fab70a4da5e0659e2.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_b7d92a32b19f4a1a9d96acccfaef22db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69683e80-4373-40da-b8b8-db1c4b5ee2b8/kubakimemeladomoja.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_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 5380 bytes
SHA-256: b3a6dfaeaf0c08ce03e35dcef12d87bfded4d1fbd9193833a3bff941ccf701c6
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10640 bytes
SHA-256: fd7242a05bb608acfe509ffe766df8c80d0a9c7a39f9857ea9de6ab21e7d6bec

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