Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a9eca95a2c328d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 18:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95f197c162651bb4de8ac934c8f714db SHA-1: c9de092e72423873e69956622260335433ee561f SHA-256: b6a9eca95a2c328dd4d35367c7f033a271f3b6313a39310f2d6c769ef9b2cda1
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, likely used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://colakcivi.com/userfiles/file/tarafalojopazodafazev.pdf
    • http://luchetti.it/userfiles/files/datizalorukupasu.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/luwifafusobojapigigodorix.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b13ece39c0---zuvemegezo.pdf
    • http://24cvety.ru/upload/files/fajepeduvo.pdf
    • http://ahkkpcm.org/userfiles/39852784937.pdf
    • https://es21sys.com/userfiles/file/72223126154.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5876365236.pdf
    • http://logo4you.dk/userfiles/file/56227994823.pdf
    • http://energo-winstal.pl/userfiles/file/kobaf.pdf
    • http://lorichphoto.com/pictures/file/24715488932.pdf
    • http://farmina.ru/uploads/files/87978577679.pdf
    • http://romento.com/uploaded_files/userfiles/files/jiginanun.pdf
    • http://inggeo.eu/userfiles/files/ramonatikezasuvujuwi.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/42647161003.pdf
    • http://dentherapia.hu/files/file/xabozu.pdf
    • https://dennismaloney.ca/upload/editor/file/xutirozubuxiv.pdf
    • https://officialbacknumber.com/editor_up/85890834899.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/tative.pdf
    • http://brandnewgoods.net/userfiles/file/duvivisusunurerid.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nekipipigazulubif.pdf
    • http://saigonford3s.com/uploads/2021-09-16/images/files/10235613926.pdf
    • http://vce34.ru/attachments/file/xinowevovuvuvulodiko.pdf
    • http://captaincook.hu/userfiles/file/27235469516.pdf
    • https://dlt-nkp.com/fileupload/file/52089261918.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/10139095642.pdf
    • https://cantarefides.ro/admin/userfiles/file/83925254049.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+mod+apk
    • 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_off0000dee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16792 bytes
font_01_sfnt_off0000f6fc.bin
5678ce51dadd91f177c245ff3ff2536e7dac5df2ef62e2aadfbd86f5acdf034e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10392 bytes
font_02_sfnt_off00010e5d.bin
1fcd6ea49c89b2ca05eb51e51c56fbb70e56b9f829110cf9ee9dd15601e11fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 17380 bytes

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