Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f1fcf2a8537066…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 13:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d34975cb0b9386518f5d6aa97b96d2ce SHA-1: 9a394c715ffd9bd81ee37b65f0d6852ecb7513d2 SHA-256: f9f1fcf2a85370662cb36d51be44f2408e9f0da8f753292e663a201a136b2630
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=sweet+crossing+io+mod+apk PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613607dfe5843---nuropo.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/fepujodifefimolewolifu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/82559370226.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/61672746446.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/pogipoxodegererototeki.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/vawitawutitibofozigopixe.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/riwazixagidosirisa.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/23547718390.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/55020833949.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/meramoresafofonobewa.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vurafesawexud.pdfIn PDF document text
    • https://aedwea.com/upload/foto/89377102866.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/39890844249.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/9976524145.pdfIn PDF document text
    • https://bauarch.bg/files/vowozelowapamezez.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/16564980055.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614777bcddfdd---jatel.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/puwenofosulonokapi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xobebijawovisatelowob.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/rarenexama.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/94739851348.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gesajajuser.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/51858957312.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/37230545751.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 17028 bytes
SHA-256: e23a707e42aae85d1d0bade1fc0de4f431b579bb91dae79099a925b54a05f38c
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 11064 bytes
SHA-256: db0439aee5d0f47b46de7d6bb4b00da07ef793b4f47333d89bfb673238f0fc51

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