Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e353c6657c6df30…

MALICIOUS

PDF

80.6 KB Created: 2021-10-19 14:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fba1f10ea8c6facb09881fc7b5d470d SHA-1: c9160163cf87e787fc11cab36fc1ae6bc3fb333b SHA-256: 8e353c6657c6df303ad7bc49ec2f1670293622d27eebd703b1299c8a282d16dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lamekatus.com/uploads/ckeditor/files/xaxajukofizajawifagiv.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/tekavidoxekaxazogo.pdf
    • https://alhasooncorp.com/Files/files/wugewejijerifosegesikuve.pdf
    • http://1hozain.ru/files/userfiles/files/midol.pdf
    • http://mijn-nederland.nl/userfiles/file/wonodajot.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/46557116241.pdf
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/30160222793.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59927190126.pdf
    • http://hanifeugur.com/image/files/kejokexudabuzoxedepovade.pdf
    • https://galerieportelouise.be/userfiles/files/pifibeneva.pdf
    • https://powerliteaac.com/userfiles/file/pejavaruxa.pdf
    • http://master-vin.ru/files/file/56757051569.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xenuzimavikivexiwe.pdf
    • http://around-sicily.net/userfiles/file/29158543456.pdf
    • http://chanhbon.vn/media/ftp/file/61235204142.pdf
    • http://armanetti.com/images/64921848130.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d0c512d1c---balimumivavat.pdf
    • https://ijtm.in/userfiles/file/lipabidokub.pdf
    • http://abwrva.com/uploads/files/nuluvidafubibikipibovikir.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/17046630429.pdf
    • http://qlinairnv.be/userfiles/file/sarisazadozop.pdf
    • http://cameranichietsu.com/luutru/files/dodomopafafesigazagetufox.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16157200794be1---kowezofipawijowasot.pdf
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=9.+s%C4%B1n%C4%B1f+almanca+ders+kitab%C4%B1+cevaplar%C4%B1
    • 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_off0000d315.bin
c21d74657b1fc517712a061271352aba1c0200e3a099eb479c2d53efe6a40ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 18620 bytes
font_01_sfnt_off000100c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16792 bytes
font_02_sfnt_off000118dd.bin
89b7bd92eab57891d6a039d5739c2462d706dd1179d8c2887dd478307cbc7340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 11140 bytes

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