Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0e22025ad25dc…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 11:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7e538a1fc2137e761ae2cbf21fb28fb SHA-1: 4e5ffafbb2544d1b09833177470ce50b35af8111 SHA-256: baa0e22025ad25dcb9011b9641d4c22ab5e94d8b6c8730f22550322e2707dc3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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 https://delphin-bau.com/ckfinder/upload/files/lufigeripimitetele.pdf
    • https://12shio3.com/contents/files/tiboninurikuguzagubuxigo.pdf
    • http://hftyby.com/upload_fck/file/2021-9-19/20210919202727673753.pdf
    • http://greenhousehotel.vn/uploads/image/files/17144970360.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafesuzumamamusesonopelal.pdf
    • http://ttmplus.com/userfiles/files/tojoxobu.pdf
    • https://eternalbliss.net/file/12552243406.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/mulumutujojitokited.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/boloxaxolaxijuvenatada.pdf
    • http://carscaso.com/js/upload/files/lirogikob.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/perezaloxipo.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/falakememodozomot.pdf
    • http://knshzj.com/CKEdit/upload/files/85452209387.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/25872924941.pdf
    • http://qunjl.com/userfiles/files/zozuguwogiwixejo.pdf
    • http://sithome.com/upfiles/file/20210901092354.pdf
    • http://studiomalpocher.it/userfiles/files/20270203180.pdf
    • http://envigest.cz/upload/file/dotatijunivereluzi.pdf
    • http://sibzakon.ru/ckfinder/userfiles/files/mogibodomuxoxo.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/1928122096.pdf
    • http://escrima-rlp.de/userfiles/file/69849418522.pdf
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/10546730788.pdf
    • http://allycatering.com/userfiles/pizekakorumid.pdf
    • http://seamacros.com/upload/file/tasib.pdf
    • http://msinziniering.com/userfiles/file/87672890151.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+special+codes
    • 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_off0000aee4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 16792 bytes
font_01_sfnt_off0000c6f6.bin
8ff69441e3c35c8a2929dbb2151f96270753ad76af7488d9ef04aa0a576bf7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 14992 bytes
font_02_sfnt_off0000ec95.bin
6518017f4fca7e84941de474eebd295a042b133efa16b271f9bdb315f3fe36fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10392 bytes

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