Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7a45bec67e2142…

MALICIOUS

PDF

87.8 KB Created: 2021-04-03 08:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c537aa1320e3198382c6e869704a53 SHA-1: 1036db0f96e9229861835f46086670bb30368179 SHA-256: 8e7a45bec67e214297ce9be6a22963792ff2c74c21638e539b5e4dea1825d8d9
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a mass of external links, with the primary suspicious URL being https://zajinet.ru/award?keyword=assiduidade+e+pontualidade+pdf. The PDF structure and embedded content suggest it is part of a link farm or phishing campaign, aiming to redirect users to potentially harmful websites.

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-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://zajinet.ru/award?keyword=assiduidade+e+pontualidade+pdf
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5fd611099c3d0.pdf
    • https://cdn.sqhk.co/xajamenujo/hfgcejt/tooltip_report_page_power_bi.pdf
    • https://cdn.sqhk.co/numokafas/gcMuhiv/video_app_for_macbook_air.pdf
    • http://jowivuv.22web.org/93461866617.pdf
    • https://cdn.sqhk.co/jidelugob/gihjbia/loxemeg.pdf
    • http://wusuraxirobi.iblogger.org/introduction_to_computation_and_programming_using_python_john_guttag.pdf
    • https://cdn.sqhk.co/zugeketinog/gijifib/iowa_storm_relief_donation.pdf
    • http://navaxubigidinaf.iblogger.org/718209558.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_603afa40ca53b.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_600bbb06aaec0.pdf
    • https://cdn-cms.f-static.net/uploads/4468819/normal_6038358823700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_c8a8e681fe6f41f298c69e897f84cab9.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8c6ce2d69ae94f0da0240300b07c4db9.pdf?index=true
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_46f4a499bd804c0f8a24d775ac622309.pdf?index=true
    • http://pawekixezad.epizy.com/verbos_en_ingles_regulares_e_irregulares_mas_usados.pdf
    • http://mexorilurolepap.rf.gd/bahubali_tamil_movie_mp4.pdf
    • http://pisasegobure.epizy.com/36607079636.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_13e200b9697845b0a80c6cea540fd583.pdf?index=true
    • http://wivovazu.epizy.com/aron_afshar_delshoore.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_4edb621d16274f0c912a035fa0ad07d7.pdf?index=true
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_c492f1b843ad4e41bd201f5e9b096727.pdf?index=true
    • http://boparozib.rf.gd/28765499333.pdf
    • http://dararexirebugus.epizy.com/zidew.pdf
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_d54edb55410242bf86114f78d78963cf.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_off00011b55.bin
afb0bed89106106b02f6d2d81125644e5f320b6ea6f448e1918a629eb100f2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 4928 bytes
font_01_sfnt_off00012c32.bin
2b75fed4856c879b186187cba6eded7f14ade3fcd5e0bb173ece2011fedf663d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 10944 bytes

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