Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec91b6198e7ea1e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 05:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5215c56878955c5afe813763d602e72d SHA-1: 064440c0cc95d5329ca90b988744ef2c5364d899 SHA-256: 5ec91b6198e7ea1edeccc9470e46cbe7fc48cfe0491888a7c2e919561d0fdc09
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. The presence of numerous embedded URLs, many pointing to PDF files on potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://jfhcoaching.nl/userfiles/files/muzijenapo.pdf In PDF document text
    • http://3qbuy.com/CKEdit/upload/files/55114582762.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/32250795521.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/99241516495.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fijulixixomefat.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/kuwunazipisoxivubu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/davodibevavam.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d3866e06c20a826a770a0b13473bb1c0/87760192165.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/68796337582.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/8327361955.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22114285726.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///16906090568.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/movuzewezizuf.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/poxerawuvofapi.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/donepamepawamodalojofese.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a2a05f8b---rigolazibaluxeduvibaroru.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/22893410917.pdfIn PDF document text
    • http://afro-safari.com/upload/files/fifexezudegotej.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/30064637404.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/25791359574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nova+launcher+beta+7PDF 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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 10400 bytes
SHA-256: 7f4e563bb71b205a65aebdb2e7ad35aebdef19a91eb52a85a5845077fa69594a
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 18200 bytes
SHA-256: cd1d6784806e8142ef3eda024f658233056940542d93aaa1d95575308a12bd9d
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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