Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e76f5709531377d…

MALICIOUS

PDF

81.8 KB Created: 2021-10-09 11:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7e3c610fad0d2fa069c9843ae5461a95 SHA-1: ee7c6eb46a5400f559d3f8782d9f8c8bef48c4da SHA-256: 7e76f5709531377dab318cbc5cf75b1d00a2182c60ae185a80bcee29a29d5480
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to unknown domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bftt.marketsearching.com/upload/files/topume.pdf In PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/kafanuvipujupolezesifed.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/64222328399.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/gudadotinatisodejukabu.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210924_105008_172.pdfIn PDF document text
    • http://hidropro.hu/upload/103230882.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/forumofezuvogepazabegana.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/47057793576.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109152314098122.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/durulagegejesunor.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/dideso.pdfIn PDF document text
    • https://novsport.com/content/File/7952214992.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/82209598025.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zanefukifuxinetoja.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/91362531535.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/44229869005.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/70321368965.pdfIn PDF document text
    • http://www.moyekolodin.com/files/94232213075.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jevezotar.pdfIn PDF document text
    • http://ternovykh.ru/content/file/vetofelefexotavip.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nuneredut.pdfIn PDF document text
    • http://synphabase.ch/upload/file/61918220638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=example+of+the+law+of+segregationPDF 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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 19964 bytes
SHA-256: 3307581bb69027efb4be03600b22553e321f96d8cc07deed8d461240d8cf2b5a
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 10976 bytes
SHA-256: 1df69cfc54256d6e5c9f59a544e66637c7c9b6441bce3fdb221381e73e3f711e

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