Malicious PDF — malware analysis report

Static analysis result for SHA-256 971e0c1b9c4a7151…

MALICIOUS

PDF

70.6 KB Created: 2021-06-05 05:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3035d0937be56b1fae0b12f492b1ce3e SHA-1: 6af083abf217f4ed545cccc8f42106e48f7a0e5c SHA-256: 971e0c1b9c4a7151f54761e8bd4ada0809f9b34711ef9b154b3024191f5c5e9a
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting, and one external URI to 'coretry.ru' which is likely a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=audi+2.0+tfsi+timing+belt+change
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/d54698b5.pdf
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5fe43be4c7e57.pdf
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/c9a59.pdf
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/joderawa.pdf
    • https://degumikiw.weebly.com/uploads/1/3/4/7/134724061/9604022.pdf
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5fe60258e8716.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_6035ae9c64fd2.pdf
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6040209d7d9f1.pdf
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5fe20fad4f4d7.pdf
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/bafinogewemas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7508fddf-2967-4e1f-abac-15dc2b77536c/cops_n_robbers_color_codes.pdf
    • http://niluputevi.pbworks.com/w/file/fetch/144588747/descargar_musica_cristiana_de_avivamiento_y_jubilo.pdf
    • http://demopefo.pbworks.com/f/zopik.pdf
    • http://kepigiwup.pbworks.com/f/8252356334.pdf
    • http://fixunomavow.pbworks.com/w/file/fetch/144445452/autumn_leaves_jazz_sheet_music.pdf
    • http://vifogajo.pbworks.com/f/chander_pahar_full_movie_hd_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/9f982e0c-354b-487a-8fc0-a973876a6969/chopin_nocturne_20_music_sheet.pdf
    • http://nagaxop.pbworks.com/w/file/fetch/144609234/how_do_you_reset_iphone_3gs.pdf
    • https://uploads.strikinglycdn.com/files/bfcece51-9920-4a37-bfeb-44aea99d2283/10315051055.pdf
    • http://mupalunava.pbworks.com/w/file/fetch/144579996/joboxetewosenuwelal.pdf
    • http://sajateves.pbworks.com/f/fiche_de_lecture_lcole_des_femmes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d729.bin
a7430c3051fa482d725ccb10b91b3a3faf6f8735f04c5ae26eba7ffbf9084b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 5772 bytes
font_01_sfnt_off0000eaaf.bin
7be3d9fef0586d46d0d389cfa677a7b58389e32d68a1953fcfe777cc50443a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10208 bytes

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