Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaf2b196448e461…

MALICIOUS

PDF

89.0 KB Created: 2021-09-10 11:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 949aab1af9b123e458256a31ed933a2e SHA-1: 84d14d654b56b5505965a608b6ae6de0d9c41994 SHA-256: afaf2b196448e4611f4e461f4f33e579bd1c93b77a0b6f6c074ac1868c5c5c82
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. This suggests an SEO poisoning or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ticaproduce.com/ckfinder/userfiles/files/62340187399.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/jijalalezavizamaxo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/43299048604.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/deruwowor.pdfIn PDF document text
    • http://www.77ice.com/upload/files/runugubimamonu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/10523936948.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufusopezetegojufezinef.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/87969714604.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4fb7ed2ac---fukuxudowawarituwe.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/34250403549.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/80441326466.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109090353491906.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/73505175962.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/9034362557.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/fuxevazi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/xitagusamusubabok.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/95331089726.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446f6bb372---95841929432.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/tunipaw.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/62413258557.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wonakomigokok.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/55662018339.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/35036066641.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/waruxabelixitoxota.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/gegakekuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+can+you+root+your+android+phonePDF 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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10688 bytes
SHA-256: 90dfc0a989f771461997c6f04ab2a8437af267684593abb2fe18173744c7191c
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 18588 bytes
SHA-256: 1c17a9757de4036515da947283fc89153716a58ff9e15cd1f0e794c7ed32da7a

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