Malicious PDF — malware analysis report

Static analysis result for SHA-256 8822771774dd627c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 12:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c389f028788e0a568ab185e95dc19afb SHA-1: eb8700dbca5f4b6bd314468bd9d4c265fed0f05e SHA-256: 8822771774dd627cb11dfb1226b6451396a9275b5c5fc7919071484af6ffab80
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high-confidence detection of 'Pdf.Phishing.Trojan'. The PDF contains an embedded URI pointing to 'seumenha.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to "piano sheet music" to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://seumenha.ru/award?keyword=carrying+you+piano+sheet+music+pdf
    • http://dofegogojewipo.iblogger.org/us_history_chapter_36_quizlet.pdf
    • http://dulomagukide.22web.org/17742850209.pdf
    • http://suzamajotibe.mywebcommunity.org/army_rifle_qualification_score_sheet.pdf
    • http://fovikoxesaweziz.medianewsonline.com/36251665646.pdf
    • http://rigudozefogo.mypressonline.com/bufiw.pdf
    • http://dejepuzalew.mygamesonline.org/kadixugusofisotasawine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/80862776152.pdf
    • http://nabafutig.myartsonline.com/modelos_de_inventarios_probabilisticos_y_deterministicos.pdf
    • http://misibumisap.rf.gd/depression_screening_guidelines_2019.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_f233ff21115d4f61b29a0e17f1a5dbf1.pdf?index=true
    • http://nenutufap.epizy.com/12831286459.pdf
    • http://vuwepimu.epizy.com/tidevinabufira.pdf
    • https://68dcd7af-f18b-45b5-966b-32b8e63886a6.filesusr.com/ugd/e54fc7_b282181b791a4c55a7a8ccc2466d144a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83399e73-05d8-4947-ad60-3c889098226e/logitech_k520_keyboard_usb_receiver.pdf
    • https://s3.amazonaws.com/bugutaj/50566476456.pdf
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_db86ad53f4bb4769b488d693f943d2cd.pdf?index=true
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_164a2030ad1446a8a47a900a7a04d2a6.pdf?index=true
    • https://s3.amazonaws.com/fifomi/zaxetotisewufebaruge.pdf
    • http://tunowik.epizy.com/dufisiri.pdf
    • https://uploads.strikinglycdn.com/files/ff59f5e9-bf9e-4969-9c9b-241bcc97a36f/battery_tender_jump_starter_reviews.pdf
    • https://s3.amazonaws.com/wukevirenesu/gifubogubijozelevit.pdf
    • https://s3.amazonaws.com/rebomedug/gidebupotosapenutuduwomuw.pdf
    • https://uploads.strikinglycdn.com/files/38ea0d28-5980-41e1-bbbd-7a00373e6d15/how_to_cite_internet_sources_in_apa_without_author.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_off0000ea84.bin
94765a4973b616916ebdffe62285748ac9b9288364df770697a513bf82f6c777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 5544 bytes
font_01_sfnt_off0000fd42.bin
d2665aa78653d8fd78aef59ef6a2fbdf960b19d46d89a1a98e8dbdb0f922abf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 10704 bytes

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