Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9809cb15701462…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26a8dd7647b66801ce7a217aadc1cdb5 SHA-1: c077601bbde1602df258afac2998685cb267d8b3 SHA-256: da9809cb157014620676177f3adcbbbc5d29e222dfc5e8394d22e966edcce0e3
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable hosting or link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for malicious redirection. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6602

Heuristics 3

  • 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
  • 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=como+contestar+llamadas+automaticamente+android PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161314ee06b848---dezuwu.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/buveruz.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/90515744203.pdfIn PDF document text
    • http://btfa.tw/upload/files/zonepipawibirafewof.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/77773282859.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b535735f4---76886097412.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/87741795374.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/povabode.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/faxefodel.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/14423410112.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/79393495030.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wusuwepuzuvipevigefen.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/gedelerokakudopufer.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/20212485182.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/91287416986.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/89462222132.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75258500226.pdfIn PDF document text
    • http://megalaserasia.com/upload///rufubidiwonej.pdfIn PDF document text
    • http://spakimthi.com/upload/files/41736961471.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/labenit.pdfIn PDF document text
    • https://aayams.com/userfiles/file/gorenomukuxotus.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/27802400015.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10664 bytes
SHA-256: dc77e453937ab79d63fb8a567537ddde4830228e5793430094321fb1eb355c78
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 18912 bytes
SHA-256: cfcb2f6bcf1b71226e3f06e0c78d33dca2cd9877463632b2155f96bf80b36ec2

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