Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64bf5e15a21dac8…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 11:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa22bc218e801e1f52302f4467becc5a SHA-1: e5d84bd609e62d9b71990d12e5284dbb9c1e4fa1 SHA-256: f64bf5e15a21dac880af1b68a6ee17479a7e6b1199bfa6944ccd1bb8e0127f5d
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest this document is part of a phishing or malware distribution campaign, likely attempting to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=behen+hogi+teri+film++filmywap
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/27c86b9ceb.pdf
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/2423edbd9a.pdf
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fdeffb638985.pdf
    • http://natnat.fun/wolf_simulator_evolutionsedjy.pdf
    • http://sallely.xyz/english_to_spanish_audio_translation_app_for_androidanv3r.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_603e6baee00ef.pdf
    • http://eferevole.com/bojangles_nutrition_bo_roundsz7nfb.pdf
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/caafaa63d5d.pdf
    • http://springital.fun/consecutive_odd_integers_word_problems_worksheetvfbqf.pdf
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/10bede9cb68873.pdf
    • https://sibewelile.weebly.com/uploads/1/3/0/8/130815008/luwijud-budad.pdf
    • http://pycnidwzxc.info/carolina_hurricanes_schedule_2018-_19mk3v4.pdf
    • http://getcreditreport.info/19276658372a2k9r.pdf
    • http://korecos.ru/why_is_my_maytag_washer_not_turning_on76wl7.pdf
    • http://yesitalia.fun/76341696082wa2mx.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_600e64059882a.pdf
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/592913b39505f7d.pdf
    • https://static.s123-cdn-static.com/uploads/4485152/normal_6005101a386d2.pdf
    • http://azules.ru/28925872760p98vr.pdf
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/2335008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/tokit/what_kind_of_batteries_does_a_taylor_scale_take.pdf
    • https://s3.amazonaws.com/zikeko/88362866152.pdf
    • https://s3.amazonaws.com/fukezavazuj/art_1117_bis_cc_riforma_condominio.pdf
    • https://s3.amazonaws.com/xetasif/how_to_teach_mental_toughness_to_young_athletes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb2.bin
23993e3ac40c054289d2c4480dd26ac057a60c9f593ea2152923cb56c8f9be07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 5380 bytes
font_01_sfnt_off000100f3.bin
a6ede0a2109db07fc7fcf3e0bc23c3d4f00ded7e7083bf6bf20e6ba40467886f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 13064 bytes
font_02_sfnt_off00012ba2.bin
5b67b9bacfc86d26c61020a5ad61d718e646a7627b4676563edea61428719f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 3172 bytes

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