Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1c80592808b7a7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 08:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fbed8df75ff01b80412d67241a622ae3 SHA-1: 484e7f6d3e3d9a71c692f14dee59ca4fa39967d1 SHA-256: 3f1c80592808b7a7d1e8d6a09b3dbf346a49462d4360f4032683d2c76d9ddcc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=tubemate+new+version+2020+download PDF link annotation
    • http://fjzy18.com/image/uload/files/gulat.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xiwuforepozup.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/mogulala.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/dosomizizumurepogu.pdfIn PDF document text
    • https://keongracun.org/contents/files/80883829193.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/1911593275.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/75330121872.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/girudezu.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/232584629613f208df327e.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/8094584034.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/89574509172.pdfIn PDF document text
    • http://lgassociates.in/uploads/63491373554.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/3601441246.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148ef2ecc05f---faxuxatowifikozorimaka.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/27304644112.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2be1387e---vajun.pdfIn PDF document text
    • https://rjpexport.com/files/xorixi.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/45919851321.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/61021686068.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/bejuwanozoludegidem.pdfIn PDF document text
    • http://ipceurope.be/assets/file/89782137850.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/19424386306134f0c2d938a.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 17188 bytes
SHA-256: 9a0656e2bce0272af0b64ee5ba42c5d52d550456cf221cda4334e41bb1746971
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 11008 bytes
SHA-256: f0e877a97578e8d768638051bb490ca66c6248a03df29b849bf0b9bb4d273b48

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