Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73aafec0ae206a4…

MALICIOUS

PDF

89.2 KB Created: 2021-04-13 07:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f00af54ddfc5ed2fcbbab56b2cc86bcf SHA-1: dcd2b5cfa9f652f306a0b82e932a603578d34749 SHA-256: a73aafec0ae206a4d1aa5fe2ce5a54b773e3540153633b43f254008b01f94971
136 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a suspicious domain, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be part of a multi-stage attack involving password-protected archives. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=how+to+prevent+cyberbullying+essay
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6009da93a1490.pdf
    • https://cdn-cms.f-static.net/uploads/4377102/normal_60136dbe68ec4.pdf
    • http://natbeach.space/what_is_a_challenge_trialn5jr4.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://naremegefo.iblogger.org/autumn_leaves_sheet_music_bass_clef.pdf
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fee94e40891e.pdf
    • https://cdn.sqhk.co/ladetozuxi/jdib39U/high_end_gifts_for_him.pdf
    • http://nutigunejome.22web.org/lutitusogamizeseve.pdf
    • https://cdn.sqhk.co/kufiremikaf/cieAjeB/14351957230.pdf
    • https://cdn.sqhk.co/zibutodepu/jTYYicw/61984654182.pdf
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5feed29c423b1.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5fdaa93ced5fe.pdf
    • http://reduslim-buy.site/xilebudedajimofojesowozavsbgr8.pdf
    • https://cdn.sqhk.co/tukepola/idRhbjd/895010459.pdf
    • https://cdn.sqhk.co/telivagawu/aKbogj9/jejofasidut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_c55763ddb0974a3b874d96823df8d706.pdf?index=true
    • http://vakakumiwizexoj.epizy.com/87693085956.pdf
    • https://uploads.strikinglycdn.com/files/b6cf23b7-be0e-40e5-b6ac-e5b81b241f51/detugu.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_c669769aaa3148f0b8d975868d34edf9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a5661ec-2760-4529-a0ef-3001e767dfe7/ashton_kutcher_baby_names.pdf
    • http://nanesipub.rf.gd/aerosols_thesis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e95.bin
5710db067a3a79348d7e5ebd1b28d6f5f69e0c1aed5eb235258bbfad12904e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 5456 bytes
font_01_sfnt_off00013151.bin
dd3ebb21a59d90058576270382394170584c9ce2cefa65d2de9d0cdda5047e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 11240 bytes

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