Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ec8468435097be…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 00:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4304b673c20580d5688cbc0f0d2bb68f SHA-1: dbb1adc4259f983b7d96bfaa9513804ef6174500 SHA-256: 64ec8468435097be8912a65120b45fadff81b781cf236fd7c23b0799b7f19e82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to obscure the final malicious destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=www+snack+video+app+download PDF link annotation
    • http://bebelino.ru/userfiles/file/17568014623.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/megesiwukimuveko.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c1389d59b9507833e882dd0dc53f489/16980878311.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/87291810621.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/45349963367.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wigovu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zawalisod.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/94492231784.pdfIn PDF document text
    • https://mihalex.by/files/files/gufoxezesabututipozusek.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/pobej.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/rapozadata.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/14982793307.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifopegekadiv.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/78151708213.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/tipifexitowaxonuxux.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/70074484218.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/jopatemiluzu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/5196992019.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109140755441748.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugimakowajipodeniti.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/fabusof.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/59803632365.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/savotogaxax.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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10548 bytes
SHA-256: 5ef7aaa2a192fcdb05c57f54e51964bd142c41b5f05066b028523e65e9127bbe
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 18064 bytes
SHA-256: 8af5d33899a3872c66d1fab78a112d3977c43b7756cf290e476c70148e2d1baa

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