Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac790d288a73a7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 21:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9702bd6d3e9c51d886f34caa09fd9b87 SHA-1: 47c083d77e4371e53851a0906041a5eed4ada3a4 SHA-256: 3bac790d288a73a7a60d52d9c397f244324425e5a02c7ccbc27b6d2135020997
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=react+native+push+ios
    • http://joyearland.com/ckfinder/userfiles/files/sinawafako.pdf
    • http://banner-ever.com/ckImg/files/zujovojifakinavavexupo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452b4d6273d---18741528783.pdf
    • https://truckforceone.eu/upload/editor/file/jipejidaxeni.pdf
    • http://musikpark-live.de/userfiles/file/59810783788.pdf
    • http://s2ipower.com/survey/userfiles/files/govotiguzodab.pdf
    • http://philipsphotographystudio.com/51620338132.pdf
    • http://ttlh.vn/storage/ckfinder/files/jutunuribepezopux.pdf
    • http://simonkuehner.de/gfx/userfiles/files/logumugalivu.pdf
    • http://exhibitionchannel.com/upload/65010292027.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88267305827.pdf
    • http://velocimapper.com/webfiles/file/nowiderikatexubolili.pdf
    • https://listapp.in/ci/userfiles/files/79587361196.pdf
    • http://dpsnowodworze.pl/userfiles/file/tatupisesonubenefeno.pdf
    • http://synergienetwork.net/userfiles/file/loluzizepipurukem.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lanobenudofovisamovimalu.pdf
    • http://hoteldanang.com/uploads/images/files/vokidozop.pdf
    • https://aradmissions.com/ci/userfiles/files/xibiz.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4a07866c---60779497172.pdf
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tamejazamodat.pdf
    • https://ooo-kenk.ru/userfiles/file/77999660231.pdf
    • http://ykzn8.com/upfiles/editor/files/9695080089.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/98350923875.pdf
    • https://kalimati.in/userfiles/file/99428868379.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_off0000bae2.bin
0c1f18f2898513ff6247bfd7f50abccc75e6beb5d437ab60848229a664ba3a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 10536 bytes
font_01_sfnt_off0000d2e4.bin
6cac9963a811ca1de7e16830cb307feadbf5be051da706e0aea8a988433c4e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 17040 bytes
font_02_sfnt_off0000ffaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 16792 bytes

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