Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e383a159168cc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 035d036296dc20cedcfccfdaa7ffaaaa SHA-1: ccd4b75c92a663509659c30154ce3b1c778c861a SHA-256: 756e383a159168cc5968724ef132f2b4562b3ee105a4fe6f3b5311972c563e90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous external links, many of which point to potentially malicious PDF files hosted on various domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://boissee.fr/userfiles/file/gobinazisurafig.pdf In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/zofebixuzufotepekagom.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/23954644611.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/81562070318.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gazakisepomeligepovigit.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/biluxibosuf.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/94237785254.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136117dcf6d4---51435909153.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/navufoxudejenovosubo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/98770026701.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196710311383.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/ligazaz.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/88717187189.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/42417024734.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/kekobekebolobaze.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-09-56-36-51.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fojusatu.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wudomawamojezuje.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac141e7da3---livififurezefibirajasowi.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109080522497762.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/5206860523.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zuxamatozepizamun.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jufojaronelokujitulomamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=a+textbook+of+fluid+mechanics+and+hydraulic+machines+by+rk+bansalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 17976 bytes
SHA-256: 435d07496b405df06b993a11d2ad68344d88b9852adbf0b861f1314bf49c20f3
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 17564 bytes
SHA-256: e6e31f028fc6f1de148a7c55a62b6e0011c597cb562423792189d856aee6e5d1
font_02_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 11272 bytes
SHA-256: 6332c921ae65081708fde11c07285e50ae16866b7bbf0a11a7fb2e0c255d4798