Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c281d6bcdc3f26…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 09:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fe773035c517c1b565e56426c958790 SHA-1: 8feac323d05955bb7247a2b25795964609860350 SHA-256: 05c281d6bcdc3f26909d39fca214971f954bd08d645d8da0387fec72387c4701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://motodubai.com/uploaded_images/files/39625045669.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/64121531597.pdfIn PDF document text
    • http://atek-ent.com/upload/file/27054464366.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fexefuxowakuge.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/rixopogasukeweverovuxav.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/98200819949.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/gonugumokagibowus.pdfIn PDF document text
    • https://maymac.info/userfiles/file/69578463296.pdfIn PDF document text
    • http://metallpress.ru/files/36574793578.pdfIn PDF document text
    • https://anaksemut.com/contents/files/mulenudokafurosadofe.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631451188.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lovubu.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/debisugutamiromo.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/76610500836.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/59435063842.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/31910449564.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/ferosusawu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebbc5af7c---15655205726.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906061528388.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rejiloxisovirimawu.pdfIn PDF document text
    • http://uhorder.com/upload/files/jalumemotogu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/puzipupusemekepe.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/sedew.pdfIn PDF document text
    • https://huanghecables.com/d/files/gifarile.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/31785701285.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/88329279651.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mrna+to+trna+chartPDF link annotation
    • 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 14604 bytes
SHA-256: 081050091f02ccd240d4527f6ceb6ce9fabf81b987d0be95ba95e280c9e13319
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 9884 bytes
SHA-256: 2b51981f9848bc35711bc59b3c0a416a7e441a8d19afe1b0235f81e1348fdbb1

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