Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc21783cb325c43…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 14:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9523bcb87ae2f6e5e5beb312469cc884 SHA-1: d810c14db0ae026e538bf49a679a0f71fd00882d SHA-256: 9fc21783cb325c430e1dd87e2bdefca693cb407dc256b9e55a459deb9604c594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish for information. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, noting the PDF's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=javascript+programmer%27s+reference+pdf PDF link annotation
    • https://apoiotelecom.com/imagens/img_fckeditor/file/25386119383.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kenirupuduk.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/72850491607.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210906055149.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/32791423064.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/masixinunadiwererifixuxo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/75164437173.pdfIn PDF document text
    • https://ienter.bg/files/poxutakuxupaletijipoj.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/wivekapogozitoxivow.pdfIn PDF document text
    • http://baove24h.org/upload/files/98805756859.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/7035101547.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/salab.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/16203590534.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109131724562761.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/35832030021.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/22148560327.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tegabigiromaxumilimibuji.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414677943f9---81968874312.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gutatem.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/39876743535.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210912072128_lpwxut.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/21914597694.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/64544481518.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/fagudat.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 17928 bytes
SHA-256: eeb9f5e27991e97f7191319af654d49853cb30935fda80efbf689d55a34f206c
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 11008 bytes
SHA-256: 88c531ddba05620e705bbf3cb87cbabc9aabbe02c87c9f2d57c90a7bb44de4f3

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