Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63c6ad0935468ed…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 04:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8342e31283fd87fe8f50b265a352fe9f SHA-1: e0f11548d9bcfa530e67934cac31839b304ea3d5 SHA-256: f63c6ad0935468ed4d09833317eb54b3c9c420e15034e95c52590c67ef0008da
126 Risk Score

Malware Insights

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

The PDF sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests an intent to redirect users to harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the suspicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sakesushilakehavasu.com/uploads/files/13640426315.pdf In PDF document text
    • https://gad-elhak.com/userfiles/file/15293072115.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/42677259925.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/98026656203.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/punomawisuxi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161336d50ac469---3088000744.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ratimebosolaxak.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kafovix.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/jonazeweturosezuravirugik.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/duvogotanovapizida.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/gerijavi.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83559516808.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/sizeda.pdfIn PDF document text
    • http://metabolit.ru/files/file/40658198785.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/4160752510.pdfIn PDF document text
    • http://apple888.vn/luutru/files/85995451822.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/70673934468.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/25968456240.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/ditovik.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613661be0beb2---42208754144.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kokazuselomexeg.pdfIn PDF document text
    • http://4yoga.by/pics/files/58969410107.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/6926305528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=average+rate+of+change+polynomial+calculatorPDF 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 11020 bytes
SHA-256: f4dbcab0d0e6f6a572f8754a22afe71feb21c79c479a21f22f578406e25e0911
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 17488 bytes
SHA-256: 97419cc0c30a4444bbc48f113d472c0f696c9ebb1f6553c94eb9f511c15e738f