Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cae71278de1a9c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 03:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27dbae3c6b68c888355351e7563ba779 SHA-1: 1828e079610395b419ecade141b73dec91b3b87b SHA-256: 93cae71278de1a9c4abbaa57ed622086b6b09e32a153ab938c08c9d43a9df793
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for directing users to external sites. Multiple embedded URLs were found, with one identified as a link farm on disposable hosting, suggesting a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tobn56.com/UpFiles/file/55512535429.pdf In PDF document text
    • https://rivieresoceanie.com/userfiles/file/24513756402.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/94885848088.pdfIn PDF document text
    • https://migger.dk/userimages/file/burigikom.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/tulugategexikojuwojim.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a45bd06d8---53284789837.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8799983861378c9210aa9.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/baxadarenotixab.pdfIn PDF document text
    • http://acelybio.com/upload/files/naxivudemenibesoligaxe.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/54671770300.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/kupamamif.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/jobazelejopiwalafaposiz.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42d11c6---83322912467.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/42583087466.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/sovufimebabojederirur.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10385147936130602bc9f9b.pdfIn PDF document text
    • http://yoron.net/up/files/88499217804.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kajazibulip.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/vetesopova.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pokok.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/6314698729.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/76285806006.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/4169678935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+know+if+someone+hacked+your+phonePDF 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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 13980 bytes
SHA-256: 5b64670bcf2dc8bf3d0d31bdf1948d9b814c30fcda001d588e10e11396cec392
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 11220 bytes
SHA-256: e673f1cafc377da50a35973b194aa7fd21d1736d2d55b4849cf6c80d5571047e