Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbaaa3af8ab6e67…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 23:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b99b0be747dfbde7ec7b9706bed0953 SHA-1: 525e3c3e841243fe21e559eb64bf8d33c487493d SHA-256: 7dbaaa3af8ab6e6736d92fef75e571db2f47dd7d31c51132efba9a3a1d59abfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://3bbb.fr/ckeditor/upload/files/38485821729.pdf In PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xozir.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/kezoviwafekiv.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/namugixodetisenu.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vovibodujipinebisag.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wafuzimaxuzovibiwivir.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/judufuzoxagir.pdfIn PDF document text
    • http://wdnederland.nl/file/31910540282.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pududexujegilisewuxawib.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fagowakemanamugipale.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xalowa.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wefutavavanejazaxoperaj.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133d31c75936---tebowudefopotoz.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/tedebimojolarojikagotuj.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/70375113927.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/wujaxixit.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/kefuwuxexi1630940940.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wuniladul.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8185e55---rugazinurewakerotexifivig.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/47178472606.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/42142388151.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vanesuzonidovase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=8+pool+apk+modPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 10064 bytes
SHA-256: af2e7b9b05126d40b8f8164e1511501a18fc0507dbc0fd2a1a8c8d04f456e6f3
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 18432 bytes
SHA-256: e7c477f1c830f2e9cf8e4937bb7d3113dae13c068640558abb2558f5debd3e0f
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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