Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de4a4861a5f5e74…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83364b28a1a8d41d5232fa9dc503b84b SHA-1: 2b362a55dd8de187623b7ff95e3974edb7eb53f7 SHA-256: 0de4a4861a5f5e742886aa76ef0fed7e33ca4ad53870edb3a1b7b20323d02ddd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the embedded links and the detection signatures point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aviteksural.ru/admin/ckfinder/userfiles/files/zilaxeberovof.pdf
    • http://brilspa.ro/userfiles/file///53964178425.pdf
    • http://obchodsezlatem.cz/upload/files/xejuwefenukajoruzeviwubeb.pdf
    • http://maryalo.com/userData/board/file/25640349520.pdf
    • http://nwatchonline.net/userfiles/file/felunuwixofefagaxo.pdf
    • https://iqrainternationalschool.org/_assets/files/potamugelutek.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/53916574540.pdf
    • http://heryeryesil.com/resimlerfiles/2563046472.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/tugawur.pdf
    • https://ebooksweb.net/files/file/sodoviguzelek.pdf
    • https://j26clean.com/upload/files/xolelavazorugola.pdf
    • https://seeandhearbetter.ie/img/shop/contents/13851482479.pdf
    • http://ivankrivanek.com/userfiles/file/feximedinarif.pdf
    • http://eco-building.cz/UserFiles/File/zesegak.pdf
    • http://www.bongbansaigon.com/uploads/files/solemugavilomaserulad.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/najaxubuvivepix.pdf
    • https://slotpt2.com/contents/files/sakenerasinurazinewumed.pdf
    • http://dmkert.hu/files/file/15752119107.pdf
    • http://fireprovietnam.net/luutru/files/8047364867.pdf
    • http://ecogestval.com/userfiles/file/razexijevogiru.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161369e1e16588---66358631567.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/jesademiralimekarif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=proportional+line+graph
    • 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_off0000c6c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
font_01_sfnt_off0000ded7.bin
850c28732405ef281e08b49270e633e607ca501783f62dfc5f50ceec5ed36d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 10364 bytes
font_02_sfnt_off0000f61f.bin
7baf2592d76749ec50e4e5de5824b427217b1b69f3e55ece804d8155f08a88a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 16652 bytes

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