Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a845e0b51f1a9fb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 19:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf68b933d000ddeb6c5e02bc4eec48b5 SHA-1: 79cce09cea71de7af20b23169a6d34cd6a78fbd7 SHA-256: 5a845e0b51f1a9fb0a5c36df2bbffed783b83b524819b39d51358e4ccc484712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The document body is heavily obfuscated and appears to be non-readable content, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mehfermobilsaglik.com/userfiles/file/9547463918.pdf In PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/26413305338.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/xodegoroti.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2qqinsgfnaue3he8rte0ehua37/80620101634.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pigoditadonusepona.pdfIn PDF document text
    • http://195exim.com/datas/files/24136885673.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/20378138607.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jabexis.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/40448975574.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gisekebibevomoligufuv.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/32842058326.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/27010633481.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/zisewizo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/28964297392.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sojuxabevolonivomabun.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/wamunoxolokagasu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vojejezobuxedunerevisozaw.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319cb62a92b---xuwamupid.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/gegalixetekemen.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/loxefepakexuvosu.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/daxuwizix.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/18017552240.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/zilexakevabaleseri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=simplify3d+extrusion+width+auto+or+manualPDF link annotation
    • 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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 18872 bytes
SHA-256: 996a15024bd86631e58f25953bc5027d84fb7c8f744b6419ffdc3c5c500b17ad
font_01_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 11412 bytes
SHA-256: 1f8e7c79ca3d89a2d1e34d7e093ae5849f8fa67d7cc1fdb69bae732004063536
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1