Malicious PDF — malware analysis report

Static analysis result for SHA-256 c185c7f4e17e4938…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 12:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6469f242f0d6ce2e79555f41ef7d9907 SHA-1: 4314a50e3629946924bfc7d69fc9c54887ebf21b SHA-256: c185c7f4e17e4938d0b6efe9f3a7edfbb91984a05bb194f6695f683ab6223c94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=tekken+7+ppsspp+game+download PDF link annotation
    • http://fisioterapiasuzzara.it/userfiles/files/xapobuzubagulul.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/12825606300.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/8525119182.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/fabomeganijifibadu.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/lutufobutunatufixinaridov.pdfIn PDF document text
    • https://mediaskills.rs/files/zowovarer.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xuzibarujokirekaw.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/jareparazagojixajenalonig.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/fetawusasanavalusimad.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-19/20210919155942107097.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5c177c8216eacf1733e5d64a55ff2333/57325887604.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210925044518.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1d43707a7da3cb588974024d06026bd9/gixemasozubokobizaf.pdfIn PDF document text
    • http://isvpro.com/custom/files/binizoxafira.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/mefopezeranudeju.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/83281534171.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/50061659448.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zafevo.pdfIn PDF document text
    • https://europartner2.pl/uploads/69356129625.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/66874557021.pdfIn PDF document text
    • https://cityface.cz/res/file/64641847593.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/narikapafanosutupazi.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/98953921741.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 10636 bytes
SHA-256: cd9fa9d5d54796410f3d56c3877407610bdf555198cd704037b30d77522eb286
font_02_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16512 bytes
SHA-256: a9c7876f55734a097be7f4a9590526acb9b7eceb5ed5633cd38c8428d1d908d7

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