Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa16b6606ce47812…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 23:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e4079eb414dd1a3a7f06f22ef59913d SHA-1: 8bffdaf82a787b1f1e2ecb58cda9d9d3aee0e4f6 SHA-256: aa16b6606ce47812ab0f1defbebf4226f7962ebb051f5f23178a07e3bda7efff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather a lure for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=mv+master+video+download+free PDF link annotation
    • http://c2r-auto.com/uploadfiles/file/2021090711575873499.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/musomirowise.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/refezukodukuganazepibejez.pdfIn PDF document text
    • http://santehnika34.ru/images/file/30795883133.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/24761856355.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/39552369288.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ca45acbc7088516a93b5decef5641f60/duvuxisurazu.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/41942231192.pdfIn PDF document text
    • https://digiconelectronics.com/media/fujajoru.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/92341465824.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xepiwujiluxibipaxovula.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/2224011377.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/legus.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/38834527635.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/80176566979.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dugupupinogumomuwuguxep.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/84156231311.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vujekukoledojazilaz.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/44164075184.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/dideso.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a84bc822f---vemeniwoserujitadewaxana.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/94209287967.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/penunoraso.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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 17400 bytes
SHA-256: cf818688283a83c0c4de10c822c91b460eaa70f08fc6016a8690d82445ac8b3d
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 10660 bytes
SHA-256: 3d87246886b48d8586ec3805ae3dd5ac5c9febd2284c83c50c111c485e47a877
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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