Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd85099157c0f8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-05 05:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f66d9520c225035e4b31a8c97afc517b SHA-1: 4cd4fa9962f57a626ca73b40e564b343b7f73417 SHA-256: c0fd85099157c0f82c8718b414b1d579412ea504d98fa2c0fa697c75d4461a88
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'jacksth.ru'. The document body, though heavily obfuscated, suggests a lure related to 'lc and its procedure', likely a pretext to drive users to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=what+is+lc+and+its+procedure PDF link annotation
    • https://cdn.sqhk.co/nopawuwam/jc0icup/barbie_popstar_dress_up_games.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/2tfjhif/punut.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/iibeLD6/wepugotujufutewumilujo.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/raxiwipola.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/idp85Vh/11894122129.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/what_are_positive_psychological_interventions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_bef21a264a65407aa7cf29903bc30be9.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_9701bd43692a4cfb858caf2b90b2948a.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/wajepizidizuna.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_29fbc827aa4d40ac9b102d8c0b981643.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bb15b4-4849-455c-8b70-f49af4d48171/chatal_band_mp3_music_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7902ba54-7e51-4f42-b8ff-7cb2dd1dc08f/77402113578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93276b9b-376a-4129-8c1d-097a4b7467c1/depisebogeziro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146351f8-9285-4a86-8c91-1d3e9d172775/29786408133.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_50bd05be899840559ef711c0a8997499.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e96f22b-f6fa-44b0-9e41-278ac686f2ee/74096421282.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_02fce7744c16441c8f8798d68074ab9d.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_d95deb6b2699473db626645ed37f25e7.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_2b79a28a6a2c4e469d2d1944c4af7b24.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_1dc9312587be46559b6433d8d230cbde.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5176 bytes
SHA-256: 87429ebf9d2752c1e21590766c995659f9245025376b61d292ed25d58e6db41a
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10196 bytes
SHA-256: d8b568eb640fb8958917ae3eeef51677f2911b437355a29819c9bcd8dc901219

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