Malicious PDF — malware analysis report

Static analysis result for SHA-256 9923a05915d3de5f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 13:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc865f927db226b711913e16bff18c07 SHA-1: fd906649891d1ed071f04467887193b4767d95b5 SHA-256: 9923a05915d3de5f6ce971f507a73148589103c7b0d0df00219ad01f82132a8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://vannordenvastgoed.nl/userfiles/file/fojategodifugebomejuner.pdf
    • http://teplospectr.ru/images/files/bivulawu.pdf
    • http://simsvizag.com/contentimages/file/nudonivev.pdf
    • https://recapress.com/ckfinder/userfiles/files/30452956605.pdf
    • https://alternativecarrepair.com/userfiles/file/37627046556.pdf
    • https://mavachhaiphong.com/upload/files/vokovenasagoxegi.pdf
    • http://photo-ostrov.com/ckfinder/userfiles/files/29433026439.pdf
    • http://sxnqx.org/upload/file/Fl202109020710228939.pdf
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/u36nflm421m0srt6t5fk6lk0ff/kulurajeposebutovusomore.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/mabumituxanupugaripug.pdf
    • https://georeno.ca/userfiles/files/beluvoninodotu.pdf
    • https://olgunbey.com/upload/ckfinder/files/34381273840.pdf
    • https://susta.vn/userfiles/file/47683967795.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef44002c8f---26386110930.pdf
    • http://riph.pl/userfiles/file/zipideniwuwabuzixigim.pdf
    • https://liur-krd.ru/userfiles/file/96986577106.pdf
    • http://tipsclubcr.com/campannas/file/6541396894.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/rabenutidi.pdf
    • https://ecohort.com/userfiles/files/39233147790.pdf
    • http://avvocato-callegaro.it/public/file/40272051276.pdf
    • https://areopag.ru/sites/default/files/uploads/solusaturuligigupa.pdf
    • http://chunmianxian.com/upfolder/e/files/20210907090100.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+wreck+it+ralph+online+free
    • 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_off0000d9a7.bin
b0e68c977d5c9b58121c94776906852602bf83c88567f097a7d5b3e3fd186a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 10580 bytes
font_01_sfnt_off0000f1c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
font_02_sfnt_off000109d9.bin
212cbb810d3e4d27f42bbe35045dd9e359dbae5b8c8dc13c9b164beae6645fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 17844 bytes

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