Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f967aeef0e936…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 02:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96aaa1a382c98ded179061d3ddb5605c SHA-1: 9deff6726913d981bc802e2daf6ccaaa40d4663c SHA-256: 828f967aeef0e9363c1d95afb16f8ebc223351256d71b3687ebc5d7b2ac15e60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=acer+palmatum+bonsai+pdf
    • http://vuzetasavuxoso.mygamesonline.org/what_is_error_code_b200_on_canon_mx922.pdf
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5ff0407b48680.pdf
    • https://koredude.weebly.com/uploads/1/3/1/4/131406285/toledipisefopon-juwezobul-zepoluvameka.pdf
    • https://gurufikenifa.weebly.com/uploads/1/3/2/3/132303388/noxuz.pdf
    • http://melowimaz.getenjoyment.net/ramayana_story.pdf
    • https://modibabebala.weebly.com/uploads/1/3/5/3/135340426/rabuxatavitut_riwaripefol_gixavok.pdf
    • https://cdn.sqhk.co/fadejiweruw/jaZacCJ/49904196404.pdf
    • http://lefuvaguvupawax.iblogger.org/sobezinuripogezadinosixos.pdf
    • http://pidusejop.medianewsonline.com/exercices_de_grammaire_francais_avec_corrigs.pdf
    • http://xelibirujegid.mywebcommunity.org/91704135936.pdf
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5fc608664579a.pdf
    • https://cdn.sqhk.co/xejudawadoni/U9r3hen/starcraft_heat_press_8-_in-_1.pdf
    • https://cdn-cms.f-static.net/uploads/4410211/normal_603ce5a56f20d.pdf
    • http://pekibimige.mygamesonline.org/bavelaleguvonug.pdf
    • http://masovizifuzaro.iblogger.org/vet_enrolment_form_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gamutazuzores.epizy.com/araluthiru_jeevada_geleya_song.pdf
    • http://sizatopus.rf.gd/brainstorming_powerpoint_presentation_template.pdf
    • http://jazipas.epizy.com/32051261305.pdf
    • http://madepadejatutof.onlinewebshop.net/antas_ng_wika_quiz.pdf
    • http://pudosuvosav.atwebpages.com/21524059375.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea0.bin
3102375e03122e2f00f2a6272368ad7a9cd1da226b6ced131e35efa23daffa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 5432 bytes
font_01_sfnt_off000100fc.bin
3d42baeff731c0e83573811ba4a8885556837d67f31826a9fe3b4e1b6a9d4a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 11020 bytes

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