Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa24dce9a1204432…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e71cb54303edc7cf8612e18360f0c3e2 SHA-1: 30abc1af48b605230afd2e55518b9bbcf844fb4d SHA-256: fa24dce9a1204432c71070564e0b721c100836084828b2491d62823df7c0e48c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing attempt. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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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