Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c124c186a9e8101…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 04:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e6f17016c58e5139ee713c4461c8c6e SHA-1: 91688b661d704cfeec5a70996549f1896864f39d SHA-256: 5c124c186a9e81011e7d4efa2cee363e6143c3c3da93f31c629bb1848a5cb7dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=install+flutter+without+android+studio+windows
    • https://austarpharma.austarchina.com/upload/files/11016915858.pdf
    • https://fulzugaskozpont.hu/files/74717597944.pdf
    • http://coming-c.com/userfiles/file/temibonogo.pdf
    • http://gptools.net/userfiles/file/lazarelorilafeperifarawa.pdf
    • https://ziyang100.com/userfiles/file/art_16319253074190.pdf
    • http://showdoimovel.com/files/files/domapulagijexin.pdf
    • http://aibrpjoaae2.specialty-match.com/upload/files/garejenojuvolowatevog.pdf
    • http://zulassungsservice4you.de/bilder/file/51144497903.pdf
    • https://skatrip.com/basefile/skatripcom/files/88463893835.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137beb337881---78571574603.pdf
    • https://ego-sofa.tw/uploads/files/202109040719125957.pdf
    • https://atrax.hr/files/93779520092.pdf
    • https://kodcomputers.ro/2664/uploads/64881607985.pdf
    • https://tanhoaphat.vn/userfiles/file/nedeja.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdf
    • http://capri.lt/userfiles/files/70891041512.pdf
    • http://rana-international.com/userfiles/files/besumolegagunu.pdf
    • http://ychnjl.net/userfiles/files/10133623451.pdf
    • http://s-privod.ru/userfiles/file/sexudi.pdf
    • http://gekon.net/userfiles/file/wozilebigedafuvil.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/44603470870.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/70204458867.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/82704245142.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/18815915503.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_off0000d44e.bin
62998695176a6c111b63a69f52cefa88c9bcf710f530a919da751cc6191ed9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 18276 bytes
font_01_sfnt_off000103f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
font_02_sfnt_off00011c10.bin
799ea19b5b41d9c4e39d4197e5b5af2eafa9e53a3648cf1b90ff22dbc78a73f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 10588 bytes

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