Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a24453ea389d480…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 06:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f82f56f0ec63dc6c6c70f0bc765334dd SHA-1: 19c3fa1671024598930d7901e3ea595ea78069a3 SHA-256: 9a24453ea389d480084cdf49111a4a63f01b17bb361c9611cbe8858f63355350
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical detection score. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to other PDF files, suggesting a phishing or scam campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mariondhuique-mayer.com/data/file/4377778972.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/51502034986.pdf
    • http://henca.com/files/details/file/zokuzaxepoti.pdf
    • https://egf.tw/test2/images/file/61363922309.pdf
    • https://chingchia.com/uploads/files/202109052254209001.pdf
    • http://mrcookie.tw/upload/editor/file/032219579797.pdf
    • http://actlogistic.vn/upload/editor/files/76686939364.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/74414785461.pdf
    • http://unstitchedfootwear.net/files/file/tizupisujukenevelir.pdf
    • http://rimini-portal.de/bilderarchiv/file/mexakifofetagaxepidabiv.pdf
    • https://nabsangram.com/userfiles/file/80407506959.pdf
    • http://topenglish.sk/app/webroot/gallery/files/41389350133.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28bea10a92a8f41255c5b7efc9c93e8d/96894255536.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/24546033144.pdf
    • http://staceyasp.com/UserFiles/file/84841503776.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/jomekipujawuziwab.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dumbf1qfd4c42m0nvs6r85pv05/31799756767.pdf
    • http://zhouzhuanx.com/v15/Upload/file/202194918174993.pdf
    • https://martabaktelor.com/contents/files/51963735996.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210906_F3261C0A565190D3.pdf
    • https://masihpt2.com/contents/files/biroduzalituribi.pdf
    • http://greenglobepms.com/uploads/25530374102.pdf
    • http://synphabase.ch/upload/file/97265920634.pdf
    • https://peterdegendt.be/file/wusudofoforovekegutofim.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jukowudebiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=market+leader+3rd+edition+intermediate+teacher%27s+book+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_off0000b862.bin
c0219beb0ea028cf59a0c7e51be8ba16a972cacb7e10a744781aa091e3853fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 11316 bytes
font_01_sfnt_off0000d29f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16792 bytes
font_02_sfnt_off0000eab1.bin
7a082cacc5f3bda96b6b3ea60ef0652efbf6672e1d859c211aff0a827a3bbf03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16816 bytes

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