Malicious PDF — malware analysis report

Static analysis result for SHA-256 4616d4ea5969d5ce…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 09:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be224763f957cef7a651f0b84ffacd52 SHA-1: 1fbd2e2f4bc070c59a860f3d36c29e460d51267a SHA-256: 4616d4ea5969d5ced0ff757916aec9ce1a5076a7b35b01e5001a555fe4e159dc
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs pointing to a link farm, suggesting an SEO poisoning or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=gta+for+android+phone PDF link annotation
    • http://peoplefineart.com/assets/202109/files/20210909093018986850.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5442f9cf9877f09a186b2b40362ce3d7/51901801459.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///21432268908.pdfIn PDF document text
    • http://cartopack.com/Images/file/naluve.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/ravazibaraveropoxod.pdfIn PDF document text
    • http://www.bash.cl/media/file/zarufi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/73075259383.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/29654381267.pdfIn PDF document text
    • http://emeat.ru/var/files/vomitabaromopodidimurigud.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091411365939.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/24166578044.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/xawokapazoj.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bupitewisimakus.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/44662837378.pdfIn PDF document text
    • http://czminghe.com/upload/files/10851901626.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/89713746125.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/boxoxutefipolo.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/62090422603.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/50197745740.pdfIn PDF document text
    • https://hirurgija.me/files/zugubavumukuradadadoranug.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613976ce1122c---42021335810.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vodemofitadobemog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 18232 bytes
SHA-256: bf2970bb0f97a34106bf2622a6099a24264a24bda48a08688bc69c08f6309290
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 10420 bytes
SHA-256: c59ddaface48966e9ff3b7d5d79214f0b2bb0797b2719e8b445cf772cb2a97d1

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