Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29926cce1eaa0aa…

MALICIOUS

PDF

76.8 KB Created: 2021-09-28 10:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84c9afbd8282988a3393b63f4abf6d25 SHA-1: 4f4c8ca278222757d93e09bc8823edefbba97ef3 SHA-256: c29926cce1eaa0aaed5be6eeb5f8f189aa6db5f7a3dbb5baafabc0340460dde8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or distribution mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on disposable hosting, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://anjingliar2.com/contents/files/88534205862.pdf
    • http://odontotecnicacoop.it/userfiles/file/81074890784.pdf
    • http://www.dean-cpa.com/files/adminpic/file/42963089227.pdf
    • https://vegan-eshop.cz/data/file/87330896302.pdf
    • http://ottotech.center/userfiles/file/rolozute.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/modub.pdf
    • http://peetersinstallatietechniek.nl/upload/files/wimegedib.pdf
    • http://toszegisuli.hu/userfiles/file/juzumexotetamifufibo.pdf
    • http://autoscuolavalerio.it/userfiles/files/xekirisaxizeneked.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/fubob.pdf
    • http://gnox.vn/upload/files/81251452835.pdf
    • http://htwy.com/upload/file/jevaxananumumewo.pdf
    • http://biaikatolikus.hu/files/file/99227013382.pdf
    • https://hanomanberjaya.com/contents/files/budebanukolugu.pdf
    • https://myparrotfood.com/user_files/files/tagotadejevuputazozila.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dasixurusewufipekedos.pdf
    • http://huh.hu/UserFiles/File/81964824944.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/wuvidileraxivuzabed.pdf
    • http://st-ark.it/userfiles/files/68609529482.pdf
    • http://wuyioutdoor.com/userfiles/file/basiwineluzifiganena.pdf
    • https://securitydm.eu/slicice/file/nakorapeweradikezu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd5804916---dedugexuwov.pdf
    • https://houstoncoinclub.org/FCKeditor/file/33902244529.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109222316592406.pdf
    • http://allprintusa.com/admin/images/file/35597906282.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=video+cutter+premium+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_off0000bfb4.bin
63af2028976f1f3594a4f5b564fe82dad820e3449ff5a93c2d66959143c7204a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 20872 bytes
font_01_sfnt_off0000f5eb.bin
89097c856aee82ca116a6558a1fd31e14a17e036e50fb1626316a31b4e5381a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10516 bytes
font_02_sfnt_off00010de5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.