Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ff5ed212534d6c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 03:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d3d5d7085b98276b38b05c554de2695e SHA-1: 22f815959566189a4052f03672308e1c5d24428b SHA-256: c6ff5ed212534d6c438f9ee8357987c9884f887168d13afe259e3946c17c20f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as potentially malicious or unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=the+book+of+beast+sagi+pdf PDF link annotation
    • http://suberubepuparo.getenjoyment.net/acumed_olecranon_plate.pdfIn PDF document text
    • http://daliadiago.com/86356847300wjfk6.pdfIn PDF document text
    • http://rankingcoach-apps.com/evenflo_car_seat_safety_recallst0v15.pdfIn PDF document text
    • http://businesslinecenter.com/gubenitugenujibamg4rw.pdfIn PDF document text
    • http://ru-payment.casa/4406914560yxlxm.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/sojaruf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470537/normal_5fce094a42707.pdfIn PDF document text
    • http://torixobo.mypressonline.com/angulos_entre_rectas_ejercicios.pdfIn PDF document text
    • http://confirmationhelpcenter.com/jezurugabegakiworowinedskzfv.pdfIn PDF document text
    • http://topstop.site/vulanadaxe4rpfl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5fec83bf9ffa2.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/24672925337.pdfIn PDF document text
    • http://winoorama.fun/40541782761l3l3f.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/89594300043.pdfIn PDF document text
    • http://strapslap.online/what_was_geralts_final_wish_netflixxjtzu.pdfIn PDF document text
    • http://ottics.ru/zapinozanedadivexux3d388.pdfIn PDF document text
    • http://rankingcoach-seo.com/bufipotunipipa47mnp.pdfIn PDF document text
    • http://copyrighytsupport.com/jazutetapelobarakemituj63q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_69ce1fd3e9a047188fa0b816a2f953e7.pdf?index=trueIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_f3fb9e1a5d604468801e475870d8fc8d.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_80dd6cf04d2c4cd98a763e24712a3740.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_3c0eaac66f4f41e4bbd9bd11e6b4fc24.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 5328 bytes
SHA-256: 2585799fa20a765686d3532fa9d43268fda6b77dc07cb7e3b164db641c3330f2
font_01_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 10596 bytes
SHA-256: fd89855e5498a2db7f7eca0ee585f5d0749e0baed38e0698fbebf86d227fb5bc
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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