Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f9ad3b4af5f314…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 08:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25859d2e65abd3b5e8a5a4addecaaea3 SHA-1: ddaa22d2dbb183d001551b6eb8fa7a2a6a76f6f8 SHA-256: 22f9ad3b4af5f31420539eb0423b73bf3497e69e5e4e9d45e8d883e7668d4d3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=starting+a+sentence+with+hence PDF link annotation
    • http://media-production.net/admin/ckfinder/userfiles/files/gomenubidijuxavowuto.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/87565645175.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/45278307527.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/17488776394.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/lipig.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kosuvunivalubalugatigudod.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/79201043158.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131132876254---jenapebew.pdfIn PDF document text
    • http://homeopathyhk.com/files/potaxekexazofilagev.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/96192171363.pdfIn PDF document text
    • https://ms1oke.com/contents/files/11814491857.pdfIn PDF document text
    • http://apple888.vn/luutru/files/31949357341.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/74394987779.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/lunafewixax.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/35080085968.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/buvapuguxome.pdfIn PDF document text
    • http://juncheng.tw/upload/files/49160667915.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62832698809.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2711f0e75---bapuluveguboja.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/jajorewekuxabepodo.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/digelimowosegukirubora.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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 17872 bytes
SHA-256: 6fe3ee7c6b77205cd30820c82ea10800efbe422758186a5aa79a4155467dd99d
font_01_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 10504 bytes
SHA-256: dc68af261d6029b76eb0779c103144898a671cb1e6b2b641dc9a65fc5d6bb69a

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