Malicious PDF — malware analysis report

Static analysis result for SHA-256 136c79ca276fa2d2…

MALICIOUS

PDF

78.9 KB Created: 2021-04-06 00:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ac1e0bcb0f8c92cc7b4c26ce3e1fd6d4 SHA-1: a0dd01315e8284dbbf79c38c28cfeb3ec707e893 SHA-256: 136c79ca276fa2d24abfea70d89efb92aa0228564479cfcae0dd6c27c7456861
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=free+wren+birdhouse+plans+pdf PDF link annotation
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/gadujonutixo.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/6875204.pdfIn PDF document text
    • http://vofufime.mypressonline.com/sadifisodebe.pdfIn PDF document text
    • http://lefomasa.22web.org/rixorerizawazewo.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/revutawakomud.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/10581325734.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/where_does_netflix_movies_to_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mufumeg.rf.gd/how_to_analyse_document_analysis.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_120ccb5c54604847919329fe97fcebcc.pdf?index=trueIn PDF document text
    • http://sigogijukajuli.rf.gd/polymer_characterization_techniques.pdfIn PDF document text
    • http://somutirawil.epizy.com/jijurujidururus.pdfIn PDF document text
    • http://nezopodadas.epizy.com/magazine_template_for_publisher.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/64975116779.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_d347c38568b54f9b9bc4b9b063978cc7.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_7147ae8a0ba5484b91dbeddfe7604e45.pdf?index=trueIn PDF document text
    • http://pijofabuzipa.rf.gd/i_robot_full_movie_online_subtitrat.pdfIn PDF document text
    • http://vawirir.atwebpages.com/feputoradaga.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/rarizobuxisujuterara.pdfIn PDF document text
    • http://jemileti.atwebpages.com/3d_to_step_converter_online_free.pdfIn PDF document text
    • http://luzawuwu.epizy.com/15729286190.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/bohemian_rhapsody_sheet_music_piano_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5316 bytes
SHA-256: a612e63eec6d738e488c6d0826f1c81ee40e5f970511314f6701577d43795094
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 11764 bytes
SHA-256: 724bcca150bebf65954eb62cb4b1218fcb4b13467f926549076110eb22d0304d

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