Malicious PDF — malware analysis report

Static analysis result for SHA-256 4312f89eec9ee0a4…

MALICIOUS

PDF

83.5 KB Created: 2021-04-18 02:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67635e337d76fc5723deaef9836cd4c SHA-1: 7aae45d132479c12316691d13a4df25d45e16e8e SHA-256: 4312f89eec9ee0a45af2cd0819e78909e610e9722a1b49b10a83754d842626ed
136 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, with one explicitly noted as an 'invisible link to suspicious domain'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of embedded URLs and the document's structure suggest it's designed to trick users into navigating to malicious sites.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=how+do+i+add+an+image+to+a+photo+on+iphone
    • https://cdn.sqhk.co/mitejapeki/ggohcgj/turbo_dismount_2_uptodown.pdf
    • http://wumomotetidofe.getenjoyment.net/debate_rules_and_regulations.pdf
    • https://cdn.sqhk.co/lovojekaboxi/uFgiviG/map_castle_minecraft_pe_android.pdf
    • http://3203epworthcres.com/physical_science_grade_12_textbookssggdq.pdf
    • http://piwulag.sportsontheweb.net/lusedofunugaxigebamom.pdf
    • http://salleapp.xyz/bilerajidag2dce1.pdf
    • http://com-login8.xyz/71354899262azp6i.pdf
    • http://kostlike.site/pomemugibajuzuralodotoro4p9ee.pdf
    • http://carishr.com/how_do_you_replace_a_water_heater_elementp7u1e.pdf
    • http://help-igcopyright.xyz/64787562824kz6ph.pdf
    • https://cdn.sqhk.co/wagomito/Aihqiad/5228552431.pdf
    • http://fijubigatusurov.scienceontheweb.net/sowobixigarovo.pdf
    • https://cdn.sqhk.co/busibelifiv/osgjhfL/dynamons_2_by_kizi_hack_version.pdf
    • http://podarokinsta365.site/73304489065lgig6.pdf
    • https://cdn.sqhk.co/fagaxirupunu/geYfEnI/78194336195.pdf
    • https://cdn.sqhk.co/tivuzofep/9gidibD/69517151077.pdf
    • http://instasale.company/zovugigegokajixapamp45m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tojabixefova/nivokivaxak.pdf
    • https://s3.amazonaws.com/wazorixekunafob/bugetudogiritunalosoza.pdf
    • https://s3.amazonaws.com/zalisujezajaje/daxeg.pdf
    • https://s3.amazonaws.com/zubuwujoxom/shark_attack_game_for_pc_free.pdf
    • https://s3.amazonaws.com/fidobakipivogit/attestation_sur_l_honneur_vierge.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_off0001072b.bin
308bafe8cbb04129a2df46f01a7ca57edc2060743a35505c496d6f73c14d6568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 5120 bytes
font_01_sfnt_off00011886.bin
8498b4321c097df705d4b74bd3a77214f230dd889b5b90de21b735fd47782c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 11192 bytes

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