Malicious PDF — malware analysis report

Static analysis result for SHA-256 65130a17890d8e77…

MALICIOUS

PDF

85.3 KB Created: 2021-03-21 10:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39245edbfdcd3dd01d1d1f41e70c106 SHA-1: 49a50b72893af1473f39fa5b814fbcec7a6c1534 SHA-256: 65130a17890d8e77b09fe337b24f8b1cfd7bcac21752f0d0e862da9de8415d18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external domains. This behavior is indicative of an attempt to drive traffic to malicious websites or distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=nptel+fundamental+of+electrical+engineering+pdf
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/53f1d9.pdf
    • http://shoop-fp.ru/xotuwumakokogisumuvekixumd2oex.pdf
    • https://cdn.sqhk.co/pixorikibam/idkjcUz/4719234909.pdf
    • http://fresh-ita.space/potivoxzeix.pdf
    • http://sollabs.xyz/xipuwu0zc4m.pdf
    • https://cdn.sqhk.co/sotisajen/gehhcKO/jumijibe.pdf
    • http://testersairf.xyz/f5ndb.pdf
    • https://cdn.sqhk.co/firokizita/ghDGujd/zodasesetaru.pdf
    • https://cdn.sqhk.co/piwojosexaja/nAhfhfa/division_of_monomials_and_polynomials_worksheets.pdf
    • http://nebo-baikala.ru/declaracion_universal_de_los_derechos_del_hombre_y_ciudadano_17897a82y.pdf
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/22f6687b81071.pdf
    • http://lnstagramverifiedsbadgeforms.com/7125442201299jev.pdf
    • https://cdn.sqhk.co/josedinis/Sgiihji/best_virtual_race_platform.pdf
    • http://alexandreablog.com/618017708615128.pdf
    • https://cdn.sqhk.co/sowumavag/ihjajhm/la_novela_amor_eterno_final.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_db65059dc0594d6982805452152ad4c0.pdf?index=true
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_2af54442af9e4417a3329756c0705f54.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_52897d63cc584f6984b30cab8566b13e.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_3044a994a59f401a9720f5585f993fdc.pdf?index=true
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_25a9bb7664e8417eb5235b3663480a6b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010818.bin
d7344a79882931dcc2a954e04374c9b18f071a496b7d512d972bcb67ebad360c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 5264 bytes
font_01_sfnt_off000119f3.bin
4a60587e87e7121b2598c733fe6aed2915336e1a23bce291b8822b1f6c0cf54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 14108 bytes

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