Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd3e758d79b97ac…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 10:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44b800e656fbc0332d924bc09e2f4a6a SHA-1: 1f8d91318c22eea1b427bee2335c68ebd27c6bfd SHA-256: dfd3e758d79b97ac860496b17556908365ae352cf0ab3e81bcce1cc02f274b5e
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external websites, many of which appear to be part of a link farm designed to redirect users. The PDF's structure and the presence of these links 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://wastran.ru/uplcv?utm_term=avee+player+pro+download
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/4947158073.pdf
    • http://italianopizzeria-pg.com/uploads/files/12097637398.pdf
    • https://actaviaserica.org/board/file/files/filuvujaropu.pdf
    • http://srtprogetti.eu/userfiles/files/tosovo.pdf
    • http://superfasttv.com/uploads/files/80048464764.pdf
    • http://denetimmusavirlik.com/userfiles/file/nerozu.pdf
    • http://travellightnepal.com/userfiles/file/90172033384.pdf
    • https://taxforce.nl/userfiles/files/10311515573.pdf
    • https://picinterior.com/ckfinder/userfiles/files/sufupeletutosa.pdf
    • http://balone.net/_upload/file///gukusuviralegovewu.pdf
    • https://samuelben-horin.com/userfiles/file/65610437664.pdf
    • http://fszhenjia.com/upfolder/e/files/20210905194547.pdf
    • http://reliancefla.com/admin/images/file/79579210181.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139532a4fe38---93696711681.pdf
    • http://silverspringabw.com/uploads/files/49833121777.pdf
    • http://capesociety.ca/uploads/files/37380368133.pdf
    • http://rexant.by/upload/editor/files/zifixedujusebuzoxukas.pdf
    • http://crediramasrl.it/public/file/3055832945.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/99630033879.pdf
    • https://altaitur.com/ckfinder/userfiles/files/46399700185.pdf
    • https://deepex.hu/hirek/files/34195815449.pdf
    • http://architettoannalisatinelli.it/userfiles/files/31314237099.pdf
    • https://renetravel.ro/images/files/bagux.pdf
    • https://capecoralliving.com/media/file/wavolorataxej.pdf
    • http://thefarmatarapahoecounty.com/userimages/24396213619.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_off0000d400.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 16792 bytes
font_01_sfnt_off0000ec12.bin
bedf9a035ba88a5e3bdb3223788d66c6d1a71a4566c469629de654874fd51584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 17772 bytes
font_02_sfnt_off00011964.bin
2ab3806b9d4548482651ad23e1b61e6afcb0d258f33c73c2409c7c209e976750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10276 bytes

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