Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dbf8fcd1c1d2eb…

MALICIOUS

PDF

100.0 KB Created: 2021-09-11 01:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faa143cb1ee0ff95bdfcd6a6a66d1191 SHA-1: 0ff1740096d5011e8c7535cd47c558c5b1a1c9ae SHA-256: 83dbf8fcd1c1d2eb3922567ac961316d5205822596576ad7aaa1712e94aa7d46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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.
  • 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 http://dailyxedayhang.com/userfiles/files/mevodudofibigisa.pdf
    • https://corpusbg.com/files/fck/file/30571134758.pdf
    • http://wpchkg.com/upload/image/file/batebifor.pdf
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/limotuxu.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631310337.pdf
    • http://hyunsin.net/userfiles/file/77105007781.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/22924732172.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/72910646611.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/57192033295.pdf
    • http://curry-box-deluxe.de/userfiles/file/lovojuzokajujogiw.pdf
    • https://suativisamsungtaihanoi.net/upload/files/labiburexug.pdf
    • https://majubesar.com/contents/files/26583498226.pdf
    • https://euro-m.si/web/dokumenti/file/lazefularodizejosibokib.pdf
    • http://hanlacsclub.com/ckupload/files/17869635726.pdf
    • https://faktxeber.ru/resimler/files/69732672474.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/75254896016.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63804914460.pdf
    • http://sethhukumchandschool.com/userfiles/file/1736455675.pdf
    • https://thuhuonglacquer.com/uploads/news_file/25079655934.pdf
    • http://5thaveseniors.org/userfiles/file/nupiza.pdf
    • http://baracenter.be/userfiles/file/rodoxulurisodopadi.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/valedugasifoladadefewe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jack+reacher+ebook+collection+free+download
    • 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_off000121a2.bin
0acd8a716772cbb9f72197e74c4b68da9c5ba1e87259d8291730f82a592ccd10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 10716 bytes
font_01_sfnt_off00013a3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
font_02_sfnt_off0001524e.bin
8546a13553dd75c1fd52804fde9fa777b5c0a383573dccd7fc39cde4312e340b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1524E 18920 bytes

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