Malicious PDF — malware analysis report

Static analysis result for SHA-256 249defc71da24439…

MALICIOUS

PDF

85.0 KB Created: 2021-05-18 22:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4708c03a7aa33a8022a398cf0057911 SHA-1: 2b70b1d7da63ad7022be39e48a2400883164f1ea SHA-256: 249defc71da2443933851a5084c0c2d8ee76d495c89101729e9f64b2e87cfa66
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'fokemale.ru', which is likely used to deliver a malicious payload or conduct phishing activities. The document body, though heavily obfuscated, contains text related to PDF exercises and wkhtmltopdf, suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=can+can%2527t+pdf+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6017df493d764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_603bf3fd7443c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd39b7ba7134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ffcc2de1a9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_60553770490db.pdfIn PDF document text
    • http://jotaxanalesuti.iblogger.org/1538844649.pdfIn PDF document text
    • http://nefetenebubuwid.iblogger.org/advanced_composite_materials_for_aerospace_engineering.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/mipeboro/does_aa_use_the_serenity_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/letter_of_recommendation_for_college_application_template.pdfIn PDF document text
    • http://mixaxab.rf.gd/59858688123.pdfIn PDF document text
    • http://sulalanetoki.epizy.com/how_to_sync_my_dell_wireless_mouse.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/sagikimididejusatatofo.pdfIn PDF document text
    • http://xovufavon.rf.gd/69938832349.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/primeiro_de_maio__feriado_nos_estados_unidos.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/jotesibepalixu.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/windows_7_embedded_os.pdfIn PDF document text
    • http://zuwipipulu.epizy.com/adolescent_psychology_download.pdfIn PDF document text
    • http://zavimefetemif.epizy.com/5340466215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f811d529-0545-4fde-ae6d-d7f63b417120/sugunabafedasefananaser.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/multimodal_deep_learning_for_activity_and_context_recognition.pdfIn PDF document text
    • http://safatagikev.rf.gd/buxupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71af52c9-807b-4cc9-90d1-0985cec9af58/how_many_hours_a_week_do_you_have_to_work_at_starbucks_to_get_benefits.pdfIn PDF document text
    • http://sidakofonol.epizy.com/7622574920.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/37411665391.pdfIn PDF document text
    • http://jimagonekitop.epizy.com/rowusajadilopasig.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_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 5124 bytes
SHA-256: e0113e4caf3dd02f12812a5651726c8b42472163d629aee0e14dcc578554e9f2
font_01_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 11668 bytes
SHA-256: a9b797e52c7404bcd0a041bb3e185720a0c8333ee4165b066fefb823875e45fb

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