Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37f4c5189818d64…

MALICIOUS

PDF

68.7 KB Created: 2021-03-24 15:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 299997a60e6e870dab690470bb1d5299 SHA-1: 4a4b25c054b3ed37766fee51f7b076872f96cb30 SHA-256: a37f4c5189818d648ffe7bdad4939b7f05587309ee6a5d31d48c9e3a00303a17
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ML classifier and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains an embedded URI pointing to 'https://soxebez.ru/123?utm_term=minions+3d+wallpaper', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a wallpaper download.

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://soxebez.ru/123?utm_term=minions+3d+wallpaper
    • https://static.s123-cdn-static.com/uploads/4393346/normal_60063a6530c0f.pdf
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5ffb310366b23.pdf
    • http://xisumagogali.getenjoyment.net/list_of_si_units_in_physics_in_hindi.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_6039e5b9a01e7.pdf
    • http://wowitaly.pro/24981131980qwt1z.pdf
    • http://kanshoper.site/zugibojyplnz.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fdae7f9c3f37.pdf
    • http://labifovejes.mypressonline.com/bringing_down_the_duke.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_600c845839f3d.pdf
    • https://cdn-cms.f-static.net/uploads/4504839/normal_60302f3a224e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://famomijis.onlinewebshop.net/cluster_sampling_example.pdf
    • http://dasobiviwadodaj.atwebpages.com/alkenes_class_11_notes.pdf
    • http://nejimafalun.onlinewebshop.net/9717714459.pdf
    • http://gumomexad.onlinewebshop.net/vinefok.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ec8ff56547f347d58e22f678d7014231.pdf?index=true
    • http://zonafikepejese.onlinewebshop.net/neet_answer_key_2020_by_nta.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_aed6b5518d554fe6a9adfcc4b068238e.pdf?index=true
    • 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_off0000d021.bin
e36e18b6191961f5b49ff57a9ec96f8b4b6130806063a24b7f2722a185cd98af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 5216 bytes
font_01_sfnt_off0000e206.bin
3881c44de0b3cf84b8a705b9a1f6dbd8f40613a0935238a3e70cfd89a4bf6afd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10396 bytes