Malicious PDF — malware analysis report

Static analysis result for SHA-256 3343a6da8c4c6161…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f7521c4845ad186f73f342ec64905960 SHA-1: 82f274476a2d291b8c229e2aa90fdddf2adc325e SHA-256: 3343a6da8c4c6161ff7b2f6f0581d62db2ec9f5fb5f0bdd6033e3381d684d408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=richard+wright+the+outsider+pdf PDF link annotation
    • http://ndc-group.ru/uploads/files/34203409452.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vibodamazajumoposek.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/povorotujodolakufubajup.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/37476255450.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/73751646143.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109061017539487.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/68495814836.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373275ca0d9---52137255392.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/letumepas.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/50799153296.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/59673322224.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/20715960688.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///19506668736.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/kiliwugibo.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/murisipaxebofe.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/gekopeveramexozamevare.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xofovoridul.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/natobularuduwa.pdfIn PDF document text
    • http://rs-entp.com/upload/file/56508723263.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/genegexaj.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 10980 bytes
SHA-256: c84a1785168af92ea6e5522a992e81d5e576d67fb1725d6e0f5ec96be195f666
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 18836 bytes
SHA-256: 9dac33e92b48158abaa6baea042040a322e74105d13a015732c3252f2d66fdc1
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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