Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd0e37850877e09…

MALICIOUS

PDF

75.0 KB Created: 2021-03-28 22:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 539cc92aee24c51e8a866304f50813fa SHA-1: 1ca044ac8302a8a49f79b1e429bcf52f65e01d8a SHA-256: cbd0e37850877e096dbb3ca89b5fbbe59961c259fad01ae8e1d1dc41d19b9acd
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be related to search terms for torrents, suggesting a lure for pirated software or other illicit content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=rosetta+stone+torrent+2020 PDF link annotation
    • http://ionatr.space/duke_fuqua_mba_employment_report9p2os.pdfIn PDF document text
    • http://9gusevshop.website/pubg_mobile_hack_android_free_download202dr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_602e4885c78f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5ff68fd65b82a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_6056caa2c0957.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/ranagib_rizutevi.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/bombsquad_mods_apk.pdfIn PDF document text
    • http://migriruy.ru/gillian_chung_alexa_chungneewq.pdfIn PDF document text
    • http://greatholl.com/74923038785etrl3.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/tukazu.pdfIn PDF document text
    • http://detonicufficiale.website/pocket_city_ios_tips1p6xz.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/1832474.pdfIn PDF document text
    • http://gijebuk.iblogger.org/miraculous_ladybug_carapace_transformation_instrumental.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6056f3bf7fa56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/giorgio_agamben_profanaes.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/biwabilape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bdd9dd-0a48-40bf-adb9-2984cd8a2ec3/dexadatekon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e8286f-e4c2-4c3b-a3b5-ed8f6881a3f1/how_to_adjust_time_casio_illuminator.pdfIn 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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 4928 bytes
SHA-256: 669adca1963b279ab4627bb118370fcfebae1d87ee28e292cf89c06d79448d64
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 11884 bytes
SHA-256: 9c56a3d376f6616ed69b382e962a5ecedf3cda3e1a51e2698c842fc69de782eb

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