Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2e5b1defc588c4…

MALICIOUS

PDF

84.9 KB Created: 2021-04-19 01:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771191658d24efaf0078f364fad1fb38 SHA-1: 2fa65508c0f25aa5590a083d6b40cc08d810db67 SHA-256: 4b2e5b1defc588c43114bef964c37b5701d13eb79aa4b8d6a667ea2433278ef4
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating external URI usage and is flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Fire and Blood', a 'Game of Thrones' prequel. The primary IOC is a URL that appears to be part of this lure, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=fire+and+blood+300+years+before+a+game+of+thrones
    • http://pss77.ru/basic_math__pre-algebra_workbook_for_dummiesahaln.pdf
    • http://risozeretelefa.22web.org/arya_samaj_books.pdf
    • http://mmuuue.space/tobabaxipaxukufto.pdf
    • http://xewixejixukumes.22web.org/sound_booster_free_for_windows_7.pdf
    • http://useporte.xyz/porque_una_mujer_no_sangra_cuando_tiene_relacioneskw4jt.pdf
    • https://cdn.sqhk.co/baxoladipezu/fw1Nmij/streamelements_chat_alerts_not_working.pdf
    • https://cdn.sqhk.co/bepemuno/9ziihcH/livogofiwatajufuleri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_43c8ebb3f5a24e01867295f38470c3bb.pdf?index=true
    • https://s3.amazonaws.com/woxorojero/telefone_fisio_forma.pdf
    • https://uploads.strikinglycdn.com/files/64b786f8-69eb-4f4b-ab0f-992734410639/34308682823.pdf
    • https://s3.amazonaws.com/gajabedafot/45225569581.pdf
    • https://uploads.strikinglycdn.com/files/cb17e60a-672d-4f28-867b-21ee9528499e/how_to_reset_my_printer_epson.pdf
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_e5a08f60b8ac48998a540d58b41def0d.pdf?index=true
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_db57e1ed7f694162bf89ebb7db66e61e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/660d1f85-2d02-4094-846e-fb946c2ea4cc/wowodibupas.pdf
    • https://uploads.strikinglycdn.com/files/9963c6f4-7e00-41ba-adee-8e0040d253d1/fedex_printing_near_me.pdf
    • https://s3.amazonaws.com/sojebelevenex/12258143670.pdf
    • https://uploads.strikinglycdn.com/files/b4cc748b-d443-4790-8c3d-4308356f0de9/91457323045.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee4.bin
830eb2d2d0bd9e87c400a05e765209165c629958ae31cf928d026c0b70a0b7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 5612 bytes
font_01_sfnt_off000111c7.bin
d231c8aa4d09d8ac92fba7612c4537f439947772438c136c40c55468da77598b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 11248 bytes
font_02_sfnt_off000137e9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 4324 bytes

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