Malicious PDF — malware analysis report

Static analysis result for SHA-256 231a2808fc4d0db2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 325deddefeb2b06cd14f55dcd57dedfc SHA-1: e16e79b04cbf3960d0ac6d3b4876a436ab40be7a SHA-256: 231a2808fc4d0db27dba556bd31df5fc0193275c885114b97238fba13cf190d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, indicating a link farm or redirection scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to obscure the final destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jagamimpi.com/contents/files/24295980819.pdf
    • http://cdjuchuan.com/upload/files/nosonupurozunogimevasoz.pdf
    • https://baxsporthorses.nl/userfiles/file/nudaxubaz.pdf
    • http://nilesk.com/userfiles/file/70075856501.pdf
    • http://sevoir.hu/uploads/file/93253489055.pdf
    • http://builderall.info/userfiles/file/kosudiwunabude.pdf
    • http://cuoredicane.it/userfiles/files/babilonerilowupisopipewo.pdf
    • http://another-partner.morefriendship.com/upload/files/65690243046.pdf
    • http://nextlab-semi.com/files/fckeditor/file/sigapidimiwagudakudetiza.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210916172024.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/40302070495.pdf
    • http://wabasnb.com/files/fckeditor/file/143880316761406d243baa1.pdf
    • https://sbsoftware.ro/admin/userfiles/file/gavipogajexude.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/genanuwetodajijovi.pdf
    • http://staceyasp.com/UserFiles/file/xuruvoje.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a30eea8ed---mijabokiwinitomumetoxifox.pdf
    • https://stonebuild.bg/f/uploads/files/ruwubuzapedite.pdf
    • http://camonetinternational.com/files/file/wavotutojoxuzewuwivibiga.pdf
    • http://nenkin-t.com/upload_img/ck/files/bugonejojumazapunizuwu.pdf
    • https://fleschimmo.lu/userfiles/files/37541251876.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1f3ff4edf4624ef83f8d383d58a3708/nejuxosilowewox.pdf
    • http://katela.net/userData/board/file/65111448083.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pinched+nerve+in+neck+pain+down+arm
    • 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_off0000dd64.bin
9d31b26e9b7912da8294f91dfe3f1eb400034665ab10dd5e2f7a36470ffcc46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16872 bytes
font_01_sfnt_off0001089f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
font_02_sfnt_off000120b6.bin
32d072d1bef5ae0157be75ec95b4cf73712f36ed631d8dd39a170c855d8f7123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10712 bytes

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