Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0eab3490d97ade…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 06:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe261c4d4c5e242df82aed4b473ce29c SHA-1: fcb9ae1a09247660bf19140455868b347770d603 SHA-256: 0d0eab3490d97ade393905466ada0da8d7f0c90f8220a487b0bb2faba9a4fea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to external sites, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ekransamara.ru/files/fagoxenevazurowipizivazu.pdf In PDF document text
    • http://100gastro.cz/soubory/files/44451772391.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/sadisana.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/21670349595.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zajidagovinerilisi.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/topokagetupowunasotekaju.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914103737749664.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/daxajiri.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/27532108055.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3e27fa5b5c2e2cdb50e0528d5f00ff54/84524042385.pdfIn PDF document text
    • http://sdes.in/uploads/47426179706.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109080753588450.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/zumajavepewizasisox.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/50693571985.pdfIn PDF document text
    • http://selispin.com/calisma2/files/uploads/58644086435.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wabirifajewitijobali.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/pabunuvubixetakom.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92349334291.pdfIn PDF document text
    • https://vpmemorial.net/images/file/burepujaxe.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3ade52775872f818a99d1fa62b8ce30b/rubuwevanajomolowadom.pdfIn PDF document text
    • http://vladekoservis.ru/files/66509301849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+keyboard+like+iphonePDF 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_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10552 bytes
SHA-256: 42155ce9b326d44b04f0509b4dbc0db5f4f6cb761edf36ab95aa5b99a2c0fe1c
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 17416 bytes
SHA-256: eace75823c08f3ee6c60856e35ffceb7006b9ac9c04c6425e93a48ff461f2d8e

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