Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ac8c294ded6ca6…

MALICIOUS

PDF

75.2 KB Created: 2021-02-07 13:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3d7e575f8572038763aab7a87bb8ec10 SHA-1: 41dc3f2e3a8cadf75e50d0474bcd6b3223fc391c SHA-256: b5ac8c294ded6ca634fb576878e18e307d4677bd1c16eb630b945df7b542668e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The embedded URL 'https://maypoin.ru/wb?keyword=sacking%20someone%20for%20poor%20performance' suggests a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and ML classifier output strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wb?keyword=sacking%20someone%20for%20poor%20performance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5fe0c5cab1c66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493198/normal_5fc5d8f079859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60146b0daf496.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/A0hgBja/62840040060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_601f14cea260c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fdc28e4576e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ffb81fa8da7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_601b605db1ff2.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/ggfhc5y/zombie_heroes_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6012a8a8ee701.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/jhhhdji/bunk_beds_with_storage_drawers_underneath.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jhfhehd/best_video_player_windows_10_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_600016ae471e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fcf0b666bbba.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/TzpOgrY/pubigonovedebexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_600101f651469.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/VNxjgrO/zisapifagumafil.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Kiijcha/ballan_holden_bacchus_marsh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paxovabaresubal.rf.gd/beautiful_small_baby_pictures.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/top_android_graphics_games_2019.pdfIn PDF document text
    • http://legasefurat.epizy.com/bluetooth_adapter_android_example.pdfIn PDF document text
    • http://sijopar.epizy.com/armstrong_vinyl_flooring_installation_guide.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5468 bytes
SHA-256: 05e2e5350dde41e234fff275415023712462f1e0f74d7c08c06fa8f45f34461b
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 10180 bytes
SHA-256: f721b8c63d833b59c526832797dd804c747b11126ba5856cf9f8ce615e624863

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