Malicious PDF — malware analysis report

Static analysis result for SHA-256 873cbee28a5cc0fa…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 14:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1fbaf31c41b9f4869c4febfeec4805cc SHA-1: 39522d7b9788d688b06a3e6c38b862b026edbd9c SHA-256: 873cbee28a5cc0fa22a5dff0a5e5faa824726507a85e1fcaad02bc6d7255a425
104 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website offering a free PDF download. This URL, along with the heuristic firings indicating a malicious PDF and a potential download button lure, suggests a phishing or social engineering attack. The ClamAV detection further confirms its malicious nature, likely as a trojan or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://jacksth.ru/award?keyword=case+files+emergency+medicine+4th+edition+pdf+free PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/jihj0Q0/calculate_percentage_between_two_numbers_javascript.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_602945c14176b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_601d56ae928d1.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/gdogehd/modern_cover_hunter_multiplayer_3d_team_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/9TRsHii/mogew.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ifgiHgj/41800805973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5ff76b808eb62.pdfIn PDF document text
    • https://cdn.sqhk.co/vegeboranida/mOBcQLb/tovulobajuboxom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degagaziv/guided_reading_lesson_plan_template_1st_grade.pdfIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_e7683bdf5d774e09aff4d9b8a61bfc3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorulusof/bartender_professional_2016_software.pdfIn PDF document text
    • http://fudavifakafolid.rf.gd/nediwapebitele.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_55b9d9fd770047be860ad10ed56bd0ad.pdf?index=trueIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_2b304c2be4114e22a26de84dbbdf10cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1d8f3c-1877-4609-9bc5-8683d03e21dc/wifijotuj.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/42941450405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8601d5-21f6-4e43-8246-0e05f8a3b102/wujozosasujejiduveja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f346782d-9ea3-4b5b-84f3-eb79f6075bc7/nujanubabesitudikukeze.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/86234557347.pdfIn PDF document text
    • http://bibosisiv.epizy.com/how_to_fix_check_engine_light_flashing.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/6457515934.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_79d80d2e3f0d429fbfd19c7715f163ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d52855-d3cb-4aa2-817f-f0ad921dfb8f/sekede.pdfIn PDF document text
    • http://nixefafezas.rf.gd/sulagomejebirutarid.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/how_to_rekey_defiant_entry_lock.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 5664 bytes
SHA-256: f616cf2ebf1123799741d4449fa6e3373af7c24af33036c85d11fa8a82559cb5
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 12260 bytes
SHA-256: 86c49e4b1b0417bf7cb58cfd3d0a627209ab78fe8e2a8f19807c0144f5fa3724

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