Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf85696782ef65b…

MALICIOUS

PDF

91.4 KB Created: 2021-03-07 07:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23871ab101b014d53c5b43ed73ef5b34 SHA-1: debd39da2d8186eeb33f8451331040920e841ac9 SHA-256: ecf85696782ef65bef0fd889a145c47a8a343dde719f031bd7acdb5eae3de602
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it uses a social engineering lure to trick users into installing a browser extension or update. The embedded URL points to a suspicious domain, likely serving as a distribution point for further malicious activity. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/aws?utm_term=what+colleges+offer+veterinary+technician+programs PDF link annotation
    • http://korecos.ru/13152089076w34eq.pdfIn PDF document text
    • http://jisotevujemi.22web.org/xuteratawazexotuguluner.pdfIn PDF document text
    • http://damvglaz1.xyz/stealth_hawk_antennaaoi3j.pdfIn PDF document text
    • http://totudini.iblogger.org/21294600288.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/xetepu.pdfIn PDF document text
    • http://org-fruit.space/what_are_good_exercises_to_lose_belly_fatja3ry.pdfIn PDF document text
    • https://fowezojufogomod.weebly.com/uploads/1/3/5/3/135307270/xigijolox.pdfIn PDF document text
    • http://rawoferifexa.22web.org/buteverewafonig.pdfIn PDF document text
    • http://bitcoins-profits.com/pomakoxaxiv2u8p.pdfIn PDF document text
    • http://eroganoficial.site/292572680597hco7.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/wexoteluwag/vertex_form_calculator_symbolab.pdfIn PDF document text
    • http://sosejuxosi.epizy.com/panolerojisi.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dopizogu.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/winrar_windows_7_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/60973361476.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/34324878609.pdfIn PDF document text
    • http://dufexupomom.rf.gd/35869257638.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/present_perfect_tense_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/53250127072.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 5604 bytes
SHA-256: 8643b364d21115ca65678e5d94f9b1ac73438618e6be075b8ad2685b84f448df
font_01_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 10524 bytes
SHA-256: ef4b14fd6e5ae588cfc5622c0762ea9beb477a015e845855b6fc8425eac8e3d7

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