Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cbd9cbedc4ff9f…

MALICIOUS

PDF

98.5 KB Created: 2021-09-20 13:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f90dd567a35b8c44153afce53cd5e0c2 SHA-1: dc26252c8b75f99ba86ba9608f847ed29ae5d517 SHA-256: 93cbd9cbedc4ff9fde2f3d21b250e07502037f507222b0c35711f6919ebf6a74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm or phishing lure. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=sekaran+2003+pdf PDF link annotation
    • http://belniig.by/public/file/fakabujofavapomulijaripol.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/62520800146.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/52888140830.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6e66328b---fesojumalaged.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/pipakarekimutonemebuso.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/34173974923.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/safixuriko.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/ludoletejev.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/noxirizimel.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/39397081802.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sexin.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/zizununewap.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/39782448270.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/davivepogoxofujolisewak.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/katul.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/76057847414.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/rufadole.pdfIn PDF document text
    • http://qwerty.pl/_data/file/37055791395.pdfIn PDF document text
    • https://mollis.rs/files/92787065827.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_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 10548 bytes
SHA-256: e66ba7acc44127e26bf26884d54de702952616f34fa62f029f2c04c3953b1765
font_01_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 19528 bytes
SHA-256: cf0653a15c5bcc3ac204aeb8158ca0ccb655a1932d3e5e7346d8674efdbe49c3
font_02_sfnt_off000164a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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