Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac1c7ac6d4980ed…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 19:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1b355fe6266ad85cfeb0e71e3e16ae3b SHA-1: 51a947f277e5ec362584f5a537f7a1dc169f56fa SHA-256: 4ac1c7ac6d4980ed32db99282739a99aa859579ccc7501cc55fcef8e61a97089
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 phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://study-abroad-travel.com/ckfinder/userfiles/file/bifikukiti.pdf In PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nosuwepamaruriwubas.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/toditejirafuvovosigadom.pdfIn PDF document text
    • https://jotelek.hu/files/file/purebozinef.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/xawupelaxigabisa.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/9129646484.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/29813070884.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/popobulatuzunitonases.pdfIn PDF document text
    • http://korytnica.net/data/files/gadujezijek.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142050e0fd31---36254340240.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/jatodapinezotuliremakojan.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nikoruwudo.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/16238354589.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109150650233598.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/gokel.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c754c990---lafifatojom.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/bimuvuri.pdfIn PDF document text
    • https://eclearusa.com/images/file/kegozipakefasev.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/96980330087.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/58073327381.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/simadadafaxaparuvo.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wopokixis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fake+gps+location+rootPDF 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_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 18820 bytes
SHA-256: 9f570820e63345894282bd6841a3c255fd187ab9e21b953ad325294b3b26cc4a
font_02_sfnt_off00013f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 10620 bytes
SHA-256: 742f8a9bc5081a46df6bb0fd06c51f663c4fda921d8624b4748a7e9ca354f517

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