Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d33fa286b0d291…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 06:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127b59cf8bd2a35434ecacf6853e44ff SHA-1: 21c3fb7fec5f298cdc7bc8d57c4cd9dce98fdbc0 SHA-256: d2d33fa286b0d2916b674b364c08c30703cc3f106e9fbc1ebfa035f748dd3746
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary function appearing to be directing users to a network of potentially malicious or SEO-manipulated PDF documents. The embedded URLs suggest a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/123?utm_term=topic+triangle+inequality+theorem+worksheet+3
    • https://josazosanika.weebly.com/uploads/1/3/4/3/134339908/kupasiwob-wanibozutug-feninotidimibef.pdf
    • https://cdn.sqhk.co/dabebasavus/dOfsnrb/wallpaper_sonic_x_shadow_hdmi.pdf
    • http://rupazaduxil.mywebcommunity.org/zovog.pdf
    • http://pifovabu.getenjoyment.net/accident_and_emergency_radiology_a_survival_guide_3e.pdf
    • http://dokojekiferej.mygamesonline.org/3555772852.pdf
    • https://cdn.sqhk.co/suzagofi/iiwFreb/dilated_cardiomyopathy_in_dogs_symptoms.pdf
    • https://cdn.sqhk.co/gojelonub/8Znge06/lafopif.pdf
    • https://cdn.sqhk.co/muwizavo/ieidhhl/mosemuzuxoxomebawigifemu.pdf
    • http://pewekelexu.mygamesonline.org/41600950893.pdf
    • https://cdn.sqhk.co/xezojutatow/emvigkx/bein_sports_channel_number_spectrum.pdf
    • https://cdn.sqhk.co/libegavezu/Ljdjjhh/chatting_apps_cross_platform.pdf
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/rawodide.pdf
    • https://vojawafi.weebly.com/uploads/1/3/1/6/131636668/a529a9b919fe.pdf
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/bawiferimaxupokuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a8be0a7-215b-4fe0-b192-5ff3a770a4fc/372034013.pdf
    • https://uploads.strikinglycdn.com/files/d698fd29-c329-47f0-9c19-94150f1b7d26/60527518005.pdf
    • http://wejufutaz.onlinewebshop.net/83006977413.pdf
    • https://uploads.strikinglycdn.com/files/5e3636f2-c0aa-47e9-abac-e5318ed90232/is_the_harry_potter_castle_ride_scary.pdf
    • https://uploads.strikinglycdn.com/files/ba9ac7e2-638e-43c7-bd3d-0af797afbfa8/harry_potter_and_the_order_of_the_phoenix_game_review.pdf
    • https://uploads.strikinglycdn.com/files/37deda1a-24cc-42ca-9bc2-837e0582d5dc/amoeba_sisters_dna_structure_and_function_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/81def3bb-c3db-4981-8fa0-dbdb6b4f79b3/chamberlain_liftmaster_professional_formula_1_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/eaedf93e-b4a3-435a-9120-708e0a925d80/30987919170.pdf
    • https://uploads.strikinglycdn.com/files/7eb738fb-92f2-4121-a37c-15f1db4e1ab1/the_holy_quran_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/675a4bef-bd9b-4917-af09-3b937de5d183/johnny_b_goode_tab_back_to_the_future_version.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_off0000e5e2.bin
eb13f7745f75ef1bf075f3b540f68b05c0a1ef819a8ad625c81fec20640d74b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 5844 bytes
font_01_sfnt_off0000f9b6.bin
02eafd4e61557d0019df48208eefc820a30a326f59a9d353b108505c41b7680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10460 bytes

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