Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4d4c40bddabd3c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56b55f5ece586016e400476439589cda SHA-1: e12ea59f67b9a6d1d0ffd7232e20d56658b47587 SHA-256: 9a4d4c40bddabd3c8a12a37f45d0d8c791bcb6734086e4582818171d4bacca4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gieskestukadoors.nl/ckfinder/files/files/wizujaduruduridavobir.pdf In PDF document text
    • http://rpsbchamber.org/editorData/file/soxofomizarosojobe.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/89714199825.pdfIn PDF document text
    • http://servmed.net/userfiles/file/gagedumebej.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/43103356019.pdfIn PDF document text
    • http://vtaky.sk/media/file/85043617081.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1ce3a47d123b644eaf1385c9117f5dd/46877752371.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xediludevor.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/97141974559.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcf48067d---tawalavogi.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/69463621938.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xisivitamox.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/92655167523.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/zomuninowibidivot.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/10802944974.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/26726814409.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/wabajikorizasunujuzobije.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/revodasokexewowu.pdfIn PDF document text
    • https://ghnservizi.com/file/jigopanijokoredad.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/xesajokes.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/mowanodoweritokedejuzati.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/25001118759.pdfIn PDF document text
    • http://spiregene.com/image/files/20210913_224655.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/xukopuzimolepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=david+copperfield+free+pdfPDF 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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 16300 bytes
SHA-256: 9b1bde72f890432abaacafbaa626f26b3b2899daa1518538000a328d872c7d4d
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10312 bytes
SHA-256: f06bc53d79325dbef3d0b3249979b3a13f6252e1128e93181c59704bc469b4a9
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1