Malicious PDF — malware analysis report

Static analysis result for SHA-256 33419945c39eb4b8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 23:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e66747e838e6c673af8cf89ba5e23a1 SHA-1: e4c3c5ab62b4a9eb0dc330d47f64c0c53ef2efc8 SHA-256: 33419945c39eb4b8be5dabfc56dd604831ff2d7d837e706a539eb179396e81b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, with a high concentration of them being part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that these links are likely used to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ptogel1.com/contents/files/fisivemixaforanilufuxega.pdf In PDF document text
    • https://tworaise.com/userfiles/file/viriwezovukusaze.pdfIn PDF document text
    • http://devveb.net/userfiles/file/guneturoxanogenusijuj.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/23287633799.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bagipamofuxumubuvowa.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/lababijuvuxigaxukita.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/garitupulivo.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zonasopakagurezazubur.pdfIn PDF document text
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bamexowigifira.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/91111566038.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/mepususo.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/loxilefumesibepimovuwu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/44832929766.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/34521033298.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zunizabipunadosuru.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vopaperevasigewamodi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911070744983.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/1854120914.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/92970386424.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/kelikivuvijaxaned.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09aebb33d20704520b72b71d452f47af/tobamij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=boot+animation+factoryPDF 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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 19896 bytes
SHA-256: 9bfce698beeb6e81447749d2d329587e96228781010f31520d8ac05a75cb14ff
font_01_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 10316 bytes
SHA-256: b18869381dbf72d9358047d4bbda86496c1d7adf73f1f5b3e1edfe68e998b24c
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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