Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee531e9cb6314ac7…

MALICIOUS

PDF

70.7 KB Created: 2021-03-31 23:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e5010634c0c89c8b1db2bb3ebbf936 SHA-1: 6ebf7e09a7bcf962557d5bbdd0aa4935bde3877a SHA-256: ee531e9cb6314ac7482057b5403b67da568544530d3c642584cabbeda2566b86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, a common technique for SEO farms or phishing campaigns. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=nonrestrictive+parenthetical+elements+worksheets
    • https://cdn.sqhk.co/butiluluvuk/cDieehg/thrift_savings_plan_us_postal_service.pdf
    • http://xijivedijimidip.mygamesonline.org/birogorobugagiwozu.pdf
    • https://cdn.sqhk.co/xanovixewin/hHigfhh/flags_of_the_world_with_names_and_capitals.pdf
    • http://rezubodojel.medianewsonline.com/reported_speech_backshift_of_tenses_table.pdf
    • http://tanijijud.sportsontheweb.net/60787705724.pdf
    • https://cdn.sqhk.co/juxezijafoz/zVjeDwT/gacha_life_videos_not_on_youtube.pdf
    • https://cdn.sqhk.co/zumedizojas/ghsW0ib/99794918287.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603d5298853aa.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_603f43a6ed0cc.pdf
    • https://cdn.sqhk.co/foseziwate/TMnyohc/larry_miller_theatres_centerville.pdf
    • https://cdn.sqhk.co/rifarako/Xjaibie/rowdy_wrestling_hack_apk_download.pdf
    • http://pikufufunuti.scienceontheweb.net/pnu_biological_science_let_reviewer.pdf
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6020b79ae9045.pdf
    • http://jedusajinud.mygamesonline.org/aristide_torchia.pdf
    • https://cdn.sqhk.co/pisapaxosabo/hggJTic/82439595134.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6031e1e17a787.pdf
    • https://cdn.sqhk.co/vozupowo/xjiifih/terra_nova_tv_show_cancelled.pdf
    • https://cdn.sqhk.co/zowolanazew/hbnCgha/ultimate_truck_driving_simulator_2020_unblocked.pdf
    • http://ribadubeko.scienceontheweb.net/systematic_sampling_method.pdf
    • http://wixujikubipom.mygamesonline.org/all_punctuation_marks_with_examples.pdf
    • https://cdn.sqhk.co/woxekivepi/ogqgigg/lefitofikujajojide.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6025cbfe46e89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_9515202e9fa147e3bb456a15e85b0ec3.pdf?index=true
    • http://masemipeba.myartsonline.com/gotixukozaweki.pdf
    • http://mifojizu.myartsonline.com/chronicle_of_a_death_foretold_chapter_1_analysis.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_6402419f44f84231ab3a739a0e8e8c93.pdf?index=true
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_eaac8e07044e49c3a80357aca72c15fc.pdf?index=true
    • 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_off0000d7a7.bin
94a4f5eb90bae011928c6214dafb2c28d5c0f36b9284d722296749be662be8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 5356 bytes
font_01_sfnt_off0000e9cf.bin
42cd3837ee2a9bb1bdbaf14c4216b06e2c071a13d71b0587584e778a4df38db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 10280 bytes

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