Malicious PDF — malware analysis report

Static analysis result for SHA-256 674ceba2cefb6e42…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 10:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bb6c65626cf3fe693a63e5367a41560 SHA-1: e38da9d95e14748ff5d2ab1ebd905c40c974de40 SHA-256: 674ceba2cefb6e42b7b96d392f4b03915d11cef1a41d3f1b9bcb96857caea2c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URLs, many using 'utm_term' parameters suggestive of tracking or redirection, points towards a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, likely used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=core+concepts+in+health+3rd+canadian+edition+pdf PDF link annotation
    • http://hattingtoemrerogsnedker.dk/userfiles/file/gazuxobuguritele.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/poxud.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddb9ae624---15145854899.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sovijimerupu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ef9383e5---tosusogaserimadajep.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/pezuxuw.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/kolasub.pdfIn PDF document text
    • http://ndt-ultratech.com/files/66055291365.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/pelovokikalefofefaf.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gusuxabelumolurik.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/sinalizagok.pdfIn PDF document text
    • https://electroagro.es/pub/files/fugujazuzimekuxudep.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/84968567399.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/solegoxojagorori.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/menugewomutukibivabinus.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/17582114323.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/kaxon.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/18987139939.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/52216011880.pdfIn PDF document text
    • https://hiroyoung.com/data/files/66385923901.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210915144445_1559851599.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/merigofapofuper.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/92203564273.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 18168 bytes
SHA-256: 315e7476a04648d87808e1250940846cfb5729de0ab22f8aee9bc61bac11e2de
font_01_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 10920 bytes
SHA-256: c0a5caa870602f78b704266b2fc3724bfd530e962f8000f083517f394fd53c5d

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