Malicious PDF — malware analysis report

Static analysis result for SHA-256 895c1a0760e97175…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 12:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5aba1c6982014336a20b56cf588529d6 SHA-1: 44c441a128cc0e6e885fa7fac94d47e0549668a2 SHA-256: 895c1a0760e971758db96054fdc5a33e4fbcd09d80351506145cf03851631d9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=coach+wallpapers+for+android PDF link annotation
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/vumusopa.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/xexetifubobeka.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/15482891158.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/nexuzozutogivufe.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/61837360741.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/90644613664.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/75548381043.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/filetejexa.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/javadesiwibitujateranom.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109101548317978.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4724182095.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091305053673499.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/37071714338.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5ff94259---60079680065.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/35922604078.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/renevolafijaxupamute.pdfIn PDF document text
    • http://gabortech.com/admin/file/wokunezanufevosip.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613341ee77477---boveporaw.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/lobeluxodoxazupasun.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/31380415543.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/33801964806.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_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 17564 bytes
SHA-256: b7e2fa3a16b8c5cf7dd417016009c4e41e65553c7d0011095f3a8947f1999bbe
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10736 bytes
SHA-256: 494d01543ec663db9c62067fcba1af34836e22cfa1bc56a393c7cd0a184a0c4b