Malicious PDF — malware analysis report

Static analysis result for SHA-256 1613f9a6a8755331…

MALICIOUS

PDF

85.9 KB Created: 2021-04-17 06:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b1b1c43f50979381898c3fa782e131 SHA-1: 51718d50fb338ec71f1dda788c1b24553f390636 SHA-256: 1613f9a6a87553313bcfb776d424b68d252d34cea01823e4c908a8f26c548f7d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'soxebez.ru', which is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=beautiful+chaos+meaning+in+english
    • http://onenature.space/how_to_login_to_swann_securityt4725.pdf
    • http://penageli.getenjoyment.net/rojozijopadasewilelem.pdf
    • https://cdn-cms.f-static.net/uploads/4443801/normal_600a1ef6ac2ad.pdf
    • http://betmoy56.com/75370579107g6hsr.pdf
    • http://nout-sale.site/is_arris_a_good_brandzlisl.pdf
    • https://static.s123-cdn-static.com/uploads/4416923/normal_5fefa40a54eb0.pdf
    • http://fb-ig-violation.com/hp_laserjet_m1212nf_mfp_dimensions5oi9q.pdf
    • http://usesoda.pro/majatosaxokuweno2l3gx.pdf
    • https://cdn-cms.f-static.net/uploads/4468289/normal_602a9592816fc.pdf
    • http://xatovapotogu.mywebcommunity.org/76889667194.pdf
    • http://detonic-shop.website/xofusuniruzitobak1rbq6.pdf
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5ffc98bcb8643.pdf
    • https://cdn-cms.f-static.net/uploads/4421050/normal_606d8bfd756e3.pdf
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5ffa7fa6466f1.pdf
    • https://cdn-cms.f-static.net/uploads/4488135/normal_60311fdab90b2.pdf
    • https://cdn-cms.f-static.net/uploads/4366317/normal_60159fd63c690.pdf
    • http://xumupizaxuto.scienceontheweb.net/zogepobopogatanano.pdf
    • https://cdn-cms.f-static.net/uploads/4370089/normal_602ef2b356e0b.pdf
    • http://55571.ru/xudirero2uy8d.pdf
    • http://rameautbxy.space/97452247429811ou.pdf
    • http://8gusevshop.website/shovel_knight_toaderrzv35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jukezeluf/is_there_a_weight_limit_in_boxing.pdf
    • https://s3.amazonaws.com/ruzaganog/the_lottery_shirley_jackson_discussion_questions.pdf
    • https://s3.amazonaws.com/leributafa/5237626298.pdf
    • https://s3.amazonaws.com/jixeremipet/fall_of_reach.pdf
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdf
    • https://s3.amazonaws.com/piradi/bajrangbali_audio_songs_telugu.pdf
    • http://tixofimisupabev.onlinewebshop.net/hidroterapia_en_nios_con_autismo.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_off0000fb30.bin
c7b8a6f0cbd724cb2a39eb80c034ad992202a503a4d624e496b2bda123d134bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 6896 bytes
font_01_sfnt_off0001125e.bin
4603b6ad54443c43fe057d0a90fd768225a7fda0f5d248802fea4626c2c1aa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 5248 bytes
font_02_sfnt_off0001241d.bin
eb97941152e99d02e228e1506eb71393671e3f92930275b4aa2f720d8a0529df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11060 bytes

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