Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0374cf125a9525…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 779ebbd3c67b03ba2a21f5ab86f4725b SHA-1: 1bdc72187bbf4a6b58d39d0cd34b84d6ced830e0 SHA-256: 2b0374cf125a95257d412ad2d2d47a32db4c76cd49a1a06503a8148755e82502
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated, suggesting an attempt to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rafaelokazakov.com/file/40419836141.pdf In PDF document text
    • https://idroilektriki.gr/files/file/28757343982.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/43457661015.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/gojuxijewol.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/foxowipuguminokisut.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/66937719918.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/batawesigodevusa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/8425450555.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/37173552597.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28219508867.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/ripesoduzurageviso.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/41323944134.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/dadaxituka.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/95l7fdve5afp9fb4k8a5f462ar/duwifinezigobide.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/sixijurimuvuruxamo.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/lagomufukonibinanup.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/29696805274.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/15292786990.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/30071264755.pdfIn PDF document text
    • http://secretinvitation.net/images/files/77576093292.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/17/90337318363.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zuzawapixobofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dream+league+soccer+19+play+storePDF 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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 10956 bytes
SHA-256: 5d7594456c2a060ebb89e43741eb0e77a342f7bb828f944e30cd260b477ac6ea
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 17756 bytes
SHA-256: cd9f785dfaf7e8f8d261c583e748b71684b82b630991e91f0377b6015914beda

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