Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ecc906e81bb70a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 02:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85ff724e55872869df48362e3fc3464f SHA-1: bce226414c68ff9547c782165394e5f6f229097f SHA-256: 09ecc906e81bb70ae4ca59cb3b2dea935ad258882ef896312ca187e33c533bf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF is designed to lure victims through search engine optimization to these dubious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://syntellect.ru/Repository/file/popabawoxusisemofog.pdf In PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/tofoguzibuja.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/voranifawowara.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5c4e6f78---19078070163.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/simatanoxisivedosonada.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xuluzuwebegagefu.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/48277393787.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/27123552409.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/38691723268.pdfIn PDF document text
    • https://anfauglir.com/images/file/88458117141.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/37538105893.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/610283329.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/50958437998.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/73669496328.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/32614134693.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/vozagoxanu.pdfIn PDF document text
    • http://gibisch.org/files/files/68592045634.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/15061155207.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/25705247801.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/47583803888.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamaxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shepley+l+ross+differential+equations+solutionsPDF 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_off0000b65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65B 16300 bytes
SHA-256: c36e1c5d51db6f192706446479c17736b1e90dd87a3f9997d5be8a2a78d33fca
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11028 bytes
SHA-256: 6798bb85be9b39268b108b71f339e38dab82a7278939549f9e3715e7ff9b96ee

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