Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ebfa149dbe902…

MALICIOUS

PDF

82.7 KB Created: 2021-05-20 15:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4eb25938c7d1724dc9338e7b11e5df21 SHA-1: 7ea3316ba6a8ed3c3c38e02f4befd13c7c9c4836 SHA-256: ff3ebfa149dbe90214259dfa42c2b47f7d91e8c2bfd2fe8869747ca0165149a6
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV and a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to game development. The presence of an external URI heuristic further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+make+a+shooter+game+on+scratch+part+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fdb7d20daa08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fe916fb53308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_606c4fa709851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5feafb41a2100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_6025454801b02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cc7b4c-4b47-4d98-96c4-3c829d4a072d/31016763089.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/95060879704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816e79e5-dc52-4840-8204-965f940688c8/70900470884.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/bin_extractor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/canon_70d_exposure_compensation_in_manual_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/doworoliwemesasilipozubo.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/hp_photosmart_d110_drivers_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/56291690678.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/88717165991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d9f2f8-6d18-4dd7-8e51-6bf2370f31d3/why_does_my_xbox_one_fan_turn_on_by_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab9787d-2523-4e9c-b76c-11c332825e0d/xegebexepe.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/free_guitar_chord_sheet_music_for_beginners.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_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 5584 bytes
SHA-256: 910bdfeb6ca70d64c17305c41790a6e572ee24213cb469d6be227058e953f086
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 10392 bytes
SHA-256: 6e539452f7f666cdda1b014dcb23e13f608f8676edc34d742091e3619ab0709e

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