Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6c6e5d70921237…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 06:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec036c9d27ac8787fd33d1d65a05d8bd SHA-1: d2aebffc142c15dbd9e6a8097cb8b42386566b22 SHA-256: bc6c6e5d70921237524b0e3a185893d6e45c1f6a1d7b83e821a37b17ae965cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to distinct domains, suggests a link farm designed to obscure the ultimate destination or host multiple lures. One specific URL, http://le-nora.com/userfiles/file/fitotukazusokedozig.pdf, is directly associated with a PDF link farm heuristic, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://le-nora.com/userfiles/file/fitotukazusokedozig.pdf In PDF document text
    • http://lovesenergy.com/file/16269720314.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109010701049959.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/57210051474.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/69503494672.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ruluwasipamemofomano.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelike.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vasijig.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/80840462598.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0fcca984---juwazeverifidazatufo.pdfIn PDF document text
    • http://plise.org/userfiles/file/90956847521.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c49od2qqbcv2cjis331qlcdoh1/texapuvenom.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/zosapugegasinaxopizeze.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/ramiso.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/jamapoditijem.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/1131713173.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/14029206357.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/38653899894.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-19-13-46-djIWlAme.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/riduxuwim.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/lezujobizutewefojebemi.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/wadologonine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jomini+art+of+war+pdfPDF 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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 18128 bytes
SHA-256: 20964356f16d4a69730c9783e62b421ff79cfa51098339f04b8ae6e65af6656e
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10392 bytes
SHA-256: 6dc2370f43ed2601a6c52617d68de7fe985316b573c263309d3b0248aceaf2ad
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1