Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e6d661b6caf89d…

MALICIOUS

PDF

79.2 KB Created: 2021-03-27 11:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce6167abc543029b5e8985c11d67b10 SHA-1: 7ff0569c517bf86c992ddd907c56cb796e66b5a7 SHA-256: 79e6d661b6caf89dbd38602ff316af034a5838c41f301a5b8fd9d111d4d9c742
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, pointing to various external PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=game+amagami+psp
    • https://cdn.sqhk.co/nuxasedazu/Mifwzhj/niketemamugo.pdf
    • http://creditinquiry.info/51370124440bcng.pdf
    • https://cdn.sqhk.co/gijosevozu/jfjaHIO/i_don_t_know_bangla_cartoon.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6011edd990b03.pdf
    • http://generatorsale.ru/sopixonawejelibufotbdtvw.pdf
    • https://cdn-cms.f-static.net/uploads/4376619/normal_6031ff8c451f6.pdf
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5ff8c67adb6ce.pdf
    • http://remontnatali.ru/acrylic_nail_set_for_beginners_uk2rixf.pdf
    • https://cdn.sqhk.co/savadapo/FDjbiiU/frosty_words_answers_level_2.pdf
    • http://kinoxca.xyz/44399519239xs01w.pdf
    • https://cdn.sqhk.co/sategexarom/bL2hgWc/free_wedding_guest_list_maker.pdf
    • https://cdn.sqhk.co/xubulozirod/9ha8Ha9/voice_changer_funny_voice_effect.pdf
    • http://myyshooop227.site/yamaha_saltwater_series_225l6o3o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_7b24e740fab54ba7ae5b141444c8dcb6.pdf?index=true
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_a841d43e8d594ba398fbe02c97298d86.pdf?index=true
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_62e788ab6f404372855693f1575f9167.pdf?index=true
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_d8a531d134a4406898e33153bb1a2b2b.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_8296b3b0aca84b20b3ad95583a92ebb9.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_4a51eeb89c9b470384c0302acb5442c0.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_a81622cfa0274cdcbf318dbc8d9f6567.pdf?index=true
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_fcbd8404b914466187858fe0fa44022f.pdf?index=true
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_95dc5392b1e04841bb8b89c916e29bdd.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_7cec6500ce5b47c28c433f786f3f4ef7.pdf?index=true
    • 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_off0000edbe.bin
c53740948ce80c7013a6ea43bbf9d96594a7284f18de394cff587800980e8f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 4536 bytes
font_01_sfnt_off0000fd27.bin
576586a4ff26d912f79770e89a7d46ed956b3bd08b96e4a179d95fbb8d7f684a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 10668 bytes
font_02_sfnt_off000121a6.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 4324 bytes

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