Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9c2571a849282…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 20:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4498541232a104a4affa2c41082c4eae SHA-1: c12cf1c6005dfcd14f8d5261eb8b4075b632d9de SHA-256: 42e9c2571a849282b4c6130115e5d03a868da2c4c89556ea9a70bbb8a91a784e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using multiple distinct, disposable hosts to host linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rgcsmt.org/ckfinder/userfiles/files/36433578930.pdf In PDF document text
    • http://dsagco.com/Upload/file/perejalulo.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210926123324.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/zomogabasimigulizini.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/tetixopoxanar.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/kubawiretewaminofuroli.pdfIn PDF document text
    • https://davnosti.ru/upload/55023540352.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zafujus.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/ruvadolibomefu.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/1558700707.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210923161115.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/28212934726.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/sonenatujitudoxoxulilemes.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • https://songhongresort.com/img/files/lijal.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xogibupob.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/35082318125.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/23226253281.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40665122612.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/3444058377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309465ddaaa---pubotelotazi.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/80718184091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+chamber+of+secrets+full+movie+in+englishPDF 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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 18084 bytes
SHA-256: f535e24e4317e7776ea6fb290ea0e2560609a9d85347b05dde7dd5abe374672f
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 11340 bytes
SHA-256: dd4834e7020c6fe3f10164192075edb02fc3e1849cd5df3717540aae269b3c1f