Malicious PDF — malware analysis report

Static analysis result for SHA-256 292736910ca0dd96…

MALICIOUS

PDF

72.3 KB Created: 2021-06-07 13:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 80e4f1e1bde493e483258f891022b6e4 SHA-1: 09b8185103a5a8f08bd0a4d381f9c4080c7435f6 SHA-256: 292736910ca0dd96c44c947fccab853cb00d996261b0101ad7b76ed6b7bc8cbb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'catamma.ru', which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, further supporting a malicious purpose.

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://catamma.ru/pbw?utm_term=how+to+mod+someone+twitch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426267/normal_60516014c1b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_600f37dc7a3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_603a27767efb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144415866/tisotutixapexupupa.pdfIn PDF document text
    • http://favixose.pbworks.com/f/winavi_video_converter_register_code.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428739/96535859996.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/davosapiw.pdfIn PDF document text
    • http://voveras.pbworks.com/w/file/fetch/144604107/mashallah_song_meaning_in_english.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/cracked_adobe_photoshop_reddit.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/xuwibolosakax.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/lidamadonimirenakanuxisas.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144454656/89983427973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb94eec-6543-4b64-b2aa-65720f504d6b/is_38_sw_special_the_same_as_38_special.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/ver_talentos_ocultos_pelicula_completa_latino.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/biblia_cronologica_reina_valera_1960_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e788cc1-e0cd-4fdb-8f48-d9dc005b909a/fivufedu.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/jujamasifi.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/21068629428.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 4896 bytes
SHA-256: b927d866462957f55a8881e9d80bdb28c35349f85f97fd2087a54b8286817bee
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10840 bytes
SHA-256: 7299ad920dbd230b21669fc32bd63ff0a79ca83b10db6bd075edfe73770e3aa7

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