Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b06235c8129ccb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 16:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4800f97517278d11f629378665f945cb SHA-1: 24caddbd7635a8cbf48d646665891e89c83d7b54 SHA-256: 66b06235c8129ccb5c63be10fdce5bb783516e9187025b5c4665842b205b81ab
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, likely intended to deliver a malicious payload or redirect to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to finding audio drivers, which is a common tactic for phishing or malware distribution.

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://kuzutuzo.ru/strik?utm_term=how+to+find+audio+drivers+for+my+pc
    • https://cdn.sqhk.co/wolowivem/ijen6jj/gravity_skydiving_bahrain.pdf
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fdd861270690.pdf
    • https://cdn.sqhk.co/reruzemafow/imFhehj/92524255686.pdf
    • https://cdn.sqhk.co/kusedesomawa/gfgjbFW/55052104879.pdf
    • https://cdn.sqhk.co/fefavezevir/hjSqbif/2730812219.pdf
    • https://cdn-cms.f-static.net/uploads/4492294/normal_602310de22c95.pdf
    • http://bimiwefumukiv.22web.org/autocad_don_t_print_border.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6037150f8b963.pdf
    • https://cdn.sqhk.co/zunezafi/fu5YUGP/speedball_screen_printing_kit_level_3.pdf
    • https://cdn.sqhk.co/juvanejejuwo/2ij3BED/47667474127.pdf
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60512dd237033.pdf
    • https://cdn-cms.f-static.net/uploads/4467306/normal_605f85d4c9d31.pdf
    • https://cdn-cms.f-static.net/uploads/4413707/normal_605f8c03cc66d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejokazemur/celestial_bodies_book_free.pdf
    • http://ruwevabebivis.epizy.com/56277303239.pdf
    • https://s3.amazonaws.com/lezopobigeza/niwodojiripibu.pdf
    • https://s3.amazonaws.com/fifuto/muwevolifufiwufiwabigal.pdf
    • https://s3.amazonaws.com/lovomijelun/how_to_cancel_adobe_subscription_for_free.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_off0000e509.bin
85972aca4ec74a7901a4e4128215e72849a9005cd16456649e3933c8bbd17286
pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5368 bytes
font_01_sfnt_off0000f749.bin
f7e9814ec6f7f7177b256652e7a9028f88998d641960196c67e47164cf73af51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 11484 bytes
font_02_sfnt_off00011e4a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 4324 bytes