Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76137f82275a7ff…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c39010c44788a9bf896b342214ee54ad SHA-1: 4eedaf1a92f83e4597ef4c98820673e8fd67756f SHA-256: f76137f82275a7ffa6e1ba1098bf472fb4a638d50401039210c193fc3b4605da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=download+photo+grid+premium
    • https://lifeteacher.tw/uploads/files/202109091107249212.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613424fd46845---lexazamug.pdf
    • http://dancephoto.ru/userfiles/files/24921307677.pdf
    • http://icbiz.ru/userfiles/file/91099426036.pdf
    • http://kleinschadenexpert.com/userfiles/file/21735165950.pdf
    • https://partetesal.ir/data/file/rivemolotej.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/59902912457.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdf
    • http://hooleihomes.com/cms_images/file/sepamuderegaruru.pdf
    • http://industrialsupplies.pk/userfiles/files/76828605383.pdf
    • https://laplacedesstores.com/upload/file/42131260743.pdf
    • https://limsurdua.com/contents/files/48286075582.pdf
    • https://ringid.vn/ckfinder/userfiles/files/tumapuzimatibuxoze.pdf
    • http://files.ibiza-ferien.de/file/buxikefevibudesuri.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/tekepurapulowenuk.pdf
    • http://eltdb.com/UserFiles/files/sujuz.pdf
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdf
    • http://bradzo-ep.com/uploads/files/24124510176.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090915154573499.pdf
    • https://carcable-bg.com/uploads/pictures/files/mutabowaki.pdf
    • http://stressmanagement-karriere.de/userfiles/file/1180506182.pdf
    • https://togelunited4d.com/contents/files/kewot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defb.bin
97c0a1e96cc289eaae092853a2f46fda6b35267b592431bfced980493ba92976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 18656 bytes
font_01_sfnt_off00010fdb.bin
686f46c3f37980ee6b551d96682dd9d42f0d7dcfb9ecced9bb6f8a5a223394d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 10860 bytes
font_02_sfnt_off0001288a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16792 bytes

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