Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af186b615df7bf2…

MALICIOUS

PDF

78.4 KB Created: 2021-10-09 12:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f93b1859301c6710dd6c7ec30691295f SHA-1: 3677c9bd44ea2af415f1608ee685e6814bd5f15a SHA-256: 0af186b615df7bf280bf79a8b6261c5f3a3bf75613a0c60a2599d5b7e4599be8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://mijinmotor.com/fckeditor/userfiles/file/nitavivakij.pdf In PDF document text
    • http://circuitoinsulargc.com/documentos/file/65273137936.pdfIn PDF document text
    • http://zuche0551.com/upload/file/11796600589.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/depovugilatisupajeri.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///vogisenasijefiwapoxiwu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dewiwozigesuma.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905130040_vbiasa.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/77102337378.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/48642201161.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/73890153698.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/11112191394.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/82982631958.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/fumepudetekirurut.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc3b53662---resoki.pdfIn PDF document text
    • https://seger.cz/userfiles/file/fagibajituwut.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/30717100385.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/rodadifegunuguxon.pdfIn PDF document text
    • http://ametansk.ru/uploads2/49649968779.pdfIn PDF document text
    • http://charontrade.hu/data/file/xakokume.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/40824f3af5e8d20d0b6a7f398915cbc2/dojedofowumidexu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/23854003815.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/vatolanopev.pdfIn PDF document text
    • https://nls.vn/upload/files/devuzidefakakuw.pdfIn PDF document text
    • http://hengtongblower.com/d/files/4686153631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=105+gbp+in+euroPDF 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 18156 bytes
SHA-256: 4376e75060ca8b519afeda649d5d37ac7bb437e5597486f5e4271a98b5543f92
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 10404 bytes
SHA-256: 82ffa259abb1fb92204ab72164e5c68391a66656d6267dc3ae20d4ef0e4f01a8

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