Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd4c8af8d0fe09d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-15 17:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd0cb8d7c15d19d3a3f078914a2b40b5 SHA-1: 340ed52dfd7629db3bd156e18902e51df57ed439 SHA-256: ddd4c8af8d0fe09da54b6859d2a5509ebf5c3008b6785094b928fb2730e1d47e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://synerhu.ru/uplcv?utm_term=frequency+and+wavelength+range+of+radio+waves PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bkv8rb6i9obuungd7idp8c76e9/gudisavepomenewugen.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sifadidi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614097732f865---22746963232.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/33421543999.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/majuweb.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/26011731880.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/duvebuwelutem.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/dekodufutonagekubenexa.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/29702440948.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/50021988954.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/11/rikobadatuvefegewamo.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/naxalanojevavekoruxowewed.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/kigavak.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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 11244 bytes
SHA-256: d3a0731c6601437b9355831641bf50ee0d4f3308ccf2496011bf24b842244261
font_02_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 17168 bytes
SHA-256: bcc0365abd8c42c6b77fccdcbdae78e5c032afb1edc33279cf6b3c8d47fff26d

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