Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc4499deb5825b1…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0299fe645016e259c133f9a734fb84d SHA-1: d86b9fc3d8b2225cda1a289423b1e5802f3feb70 SHA-256: cdc4499deb5825b1078765a73b2aab725a24e62cbcd61a3228a4bda0fb17f245
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only content and embedded clickable link, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_IMAGE_LURE' and the presence of numerous external URIs, including one pointing to 'coretry.ru', strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=yiyo+mod+apk+download
    • http://vietsonplastic.com/uploads/userfiles/file/ginota.pdf
    • http://photou.cc/ckfinder/userfiles/files/vidirijowalo.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a065378881cca2a1bd795af12ce891f8/finiseditas.pdf
    • https://sanaspinler.com/calisma2/files/uploads/gujosoxafemedaju.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/2819254660.pdf
    • http://chixue.com/uploadfile/file/20210902055244.pdf
    • http://hytechplus.com/userfiles/file/3761666915.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/29039406953.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/migusegokejuj.pdf
    • http://orikon.net/Images_upload/files/12478650725.pdf
    • https://thuhuonglacquer.com/uploads/news_file/25079655934.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vazivinolegelola.pdf
    • https://santa.my/images/users/00000000/files/nepekupek.pdf
    • http://sartor.ru/upload/files/33319106360.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/vilom.pdf
    • https://cevhertemizlik.com/userfiles/files/xesoluf.pdf
    • https://materiale-parchet.ro/fisiere/file/tewowefujo.pdf
    • https://gobelsprofil.com/upload/files/96139750189.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/beredugivo.pdf
    • https://stvorki.ru/files/file/mapimoxirawigibefativa.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ei3rn3hcqk7t45mk8n5k0e0rqe/rejawemaverutebab.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/56638268971.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_off0000aee9.bin
56925c95bb5241a88e635fb4de5f163d30aeb28ce901fd8f0eb3cd26fb519316		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 14060 bytes
font_01_sfnt_off0000d17e.bin
a82c38343c3eb8e7077f4fb5972b99662caad353d155f66c3bc24787604efad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10332 bytes
font_02_sfnt_off0000e8bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes

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