Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4cca25d87e78d1…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 15:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a856c2204cb49d16ffaa56be833098c0 SHA-1: 274b3a90b8fb851a1f60cf7c0b06b18f3dac316a SHA-256: 3f4cca25d87e78d1c6347fa9ead3321c9c670c849199f61ab2dd8b055cbb7b01
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'Cub cadet parts manual'. The embedded URL points to a suspicious domain, likely serving as the initial point of contact for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=cub+cadet+parts+manual+lt1050 PDF link annotation
    • http://vuvefezod.iblogger.org/pubejazorewiduzaruna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5ffa2d496679a.pdfIn PDF document text
    • http://salea.site/robotek_bluetooth_headphones_pricetcr8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_602e330684715.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/dgjjdgc/red_rocks_event_calendar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_5fd319b1a21c9.pdfIn PDF document text
    • http://edapog.online/matlab_legend_komutusk5db.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/gfzgfgf/16207005199.pdfIn PDF document text
    • http://mosaniz.22web.org/dragon_ball_games_free_full_version.pdfIn PDF document text
    • http://svarka-aurora.online/what_is_the_effect_of_syntactic_parallelismdoiec.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/vonusirukete/gimezowajujizafowedasid.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/aqeedah_tahawiyyah_hamza_yusuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sorimexelajojowudejix.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/roliw.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/spring_boot_security_form_login_example.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/jijiguke.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/60462292239.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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 5580 bytes
SHA-256: 3c8811079d46fdadfda24ddba86f602635630152d2bc1450173aed70459d55ea
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 12148 bytes
SHA-256: 13514318b263c21cb51e90444bf28a667f31580785a3ec0c40ab2b84a3264a08

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