Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0045f63fc2660…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 23:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65192a95b0591f66e04302bc8bbb176b SHA-1: d4c53c541b01bf3394f7259220030e84c697b603 SHA-256: b1c0045f63fc26600826607dd6060a7d1cf2ae082236931fe89ca52fb3a2d152
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or suspicious-looking domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=radio+maryja+na+android
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/45485638317.pdf
    • http://salman-is.com/userfiles/file/pozisajulivisasolo.pdf
    • https://drisraadentalcenter.com/userfiles/file/fibebumafiduzo.pdf
    • http://boldogelet.hu/media/pavarewawexanefozop.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132833796fc3---zopoxelez.pdf
    • http://foto-recepty.sk/images/fotky/zuwebawiwupalos.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca15e9bf1---sijakekopigar.pdf
    • https://granitnet.hu/editor_up/13036775097.pdf
    • http://chochosanencino.com/uploads/files/15721861288.pdf
    • http://laptopcuhaiphong.vn/upload/files/65657460342.pdf
    • http://ahnil.com/userData/board/file/bafabuwepilalufufula.pdf
    • http://chirineli.com/img/lib/file/gorerejopufavuz.pdf
    • http://boki.hu/editor_up/rozizaderowel.pdf
    • http://arucax.am/user_images/file/momulalasadudamopuzono.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/zebotun.pdf
    • http://keyday.ru/files/files/95789490029.pdf
    • https://kidneystonetreatment.in/userfiles/files/50816066729.pdf
    • http://cocoon-source-harmonie.fr/public/file/43451519966.pdf
    • http://nacyc.jp/Upload/file/gekiwoliwokivekar.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210922_43A89F08B6414162.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/wedetagigonizafener.pdf
    • http://handsonmontessoripk.com/userfiles/files/munuruwadi.pdf
    • http://guidesdugrandlarge.fr/images/import/file/gevapoteg.pdf
    • https://pixel.bg/img/file/19932592863.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/54887928472.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_off0000df69.bin
c9d72a20c33fb3babaf03e44deab9467b5de8f5a8a1d023ea195506226da06ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10256 bytes
font_01_sfnt_off0000f650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
font_02_sfnt_off00010e62.bin
91d7c79ecf0a379e9b739a0c09e7e9e021f71bbc0dd5b79cfd07dafdd257df7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 18500 bytes

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