Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3743982d346b7b…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 17:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aeff78368c3220c68766d006f9d62b0c SHA-1: 7230e1904f31dccc20de508434756f5268312d36 SHA-256: 9f3743982d346b7b7c2f55a483aae8b1ee2e7454fd6a8a844149b8b3b26b5f94
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are structured to appear as file downloads, suggesting a role in distributing further malicious content or directing users to phishing sites. The PDF structure and embedded links indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=cbse+class+9+words+and+expressions+solutions PDF link annotation
    • https://receptabc.hu/images_banner/files/22254357974.pdfIn PDF document text
    • http://konberdbio.com/upload/files/raxepiju.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/vejitepir.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/57539960373.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xuvilekimalimaranofad.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887ded4110---mofavebirolobabipo.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vixevotijoliwef.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/41845535115.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/94264295086.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/naxot.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nozopi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/jojiravugifoforagile.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ratamijekesamumolarobabiv.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/78330129744.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/83870421749.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/wabaki.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/gobidafutofaf.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/59429228152.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/torolemi.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/vemozafudoromonovomifokel.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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16044 bytes
SHA-256: 7c0c2c07aa3989da2bb7d073b48cdc110283cdd2c109ea6323c7935c1703d537
font_01_sfnt_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 11136 bytes
SHA-256: e3d7adc8be20de36afaf112769bf63f8621750bc946529994aec630970cda4b1
font_02_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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