Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a318ede46202676…

MALICIOUS

PDF

93.4 KB Created: 2021-09-20 01:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1141d99d6ca90e6adeaffe85325e14b SHA-1: 8a891f26fcffa836297588f0a099f602eaea0708 SHA-256: 6a318ede462026762ea082791f9a65630f7cf18250b44ac3fc9e1c83a4690976
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=movies+with+quicksilver PDF link annotation
    • http://proxima-online.it/public/file/liwonavewirefow.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/lovol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382de6c6405.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sesubavipejur.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/79037244100.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/vatidikukutuluwezabiv.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35589319659.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/66889582495.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/42457347938.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gorotova.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/muboxuberovalusalerelite.pdfIn PDF document text
    • http://saaretravel.ee/images/file/libopewimijaraxibinif.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/65063210663.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/21589179070.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lanidunedamanisasif.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/lumokemub.pdfIn PDF document text
    • http://domplus.su/userfiles/files/2893509848.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d231f5a6ae---41561539174.pdfIn PDF document text
    • https://strechybenesov.cz/content/nabodugusugakodopilevisaz.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/53240120668.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/36138479657.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/44852094249.pdfIn PDF document text
    • http://dhf-china.com/d/files/niwixejipodotanitivenewa.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/jevup.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/28979916150.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10544 bytes
SHA-256: 5d605dc6ab16fa738d5eeee101d3f5801bf1d4f88a9655903e97426fe8ff1ad7
font_01_sfnt_off0001212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 17944 bytes
SHA-256: c6f34e41c96e521e447fa5dd3818cc0ed78aabf3572e5e0fa9d9d93fa4081c21
font_02_sfnt_off00015019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1