Malicious PDF — malware analysis report

Static analysis result for SHA-256 5005d76b730df84c…

MALICIOUS

PDF

98.2 KB Created: 2021-09-23 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7bb42aab3640c9529760055d2e00d1b SHA-1: f2739fbd111aa9e0fdb08191489ee6655bf1164c SHA-256: 5005d76b730df84cb6057c73cb1dcde3111b98d0eb4426a69a6099186030aece
142 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or trick the user into downloading a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://liftsystems.ro/LiftFiles/file/20615804371.pdf In PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fifugejazu.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/subaru.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/makebofazup.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/16560375361.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5280ff5b---ruzowesunigovenekolupibum.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/55992242916.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/83686525226.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pewiwetogixevakoledokuni.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/gokiribobidewu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/luzimosifuzaleganedowomeb.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/17344722011.pdfIn PDF document text
    • http://mobil-tech.com/files/dopol.pdfIn PDF document text
    • https://megashina24.ru/files/files/58585990293.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c3e04131---11617748143.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/jeruvi.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/53844794578.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/parividurevugimovidunibe.pdfIn PDF document text
    • https://citronel.com/userfiles/files/37569822800.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/66624433039.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/kudovudogalaxa.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/47957237463.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/22410956799.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/58977086979.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/tezedilopowasabewepi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/4418068030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=new+movie+download+in+tamilrockersPDF 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_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 17460 bytes
SHA-256: 74fa61f688e4032cc1ad5115ecd40b3dd3e8c089702aa0cb542c28b24a031df6
font_02_sfnt_off00016215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16215 10752 bytes
SHA-256: 923948a5f67abc3165e0055f2dcd2fda4cac50e41a2e5a1d44317ce78164806b

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