Malicious PDF — malware analysis report

Static analysis result for SHA-256 a346f60f934fd37e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 13:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6600b88766078a731b737e5710af5cf6 SHA-1: 57c744ff420e4f0fbc2dfe513bc82178c2a07784 SHA-256: a346f60f934fd37e79e40dea665aa914eaaaa5954d57ba83ae613bb3d729d130
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=detect+keylogger+android PDF link annotation
    • https://marbeyoyun.com/calisma2/files/uploads/67798811434.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_141930_716.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kofekozapufenizagaw.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25302752996.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/neraruboloxodovid.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/31434702348.pdfIn PDF document text
    • http://schturman.ru/files/files/pujorurufedevanes.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908155347.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630789773.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/lajegozizemuti.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/78759024261.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofiku.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132b9b368---bipix.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/90507467365.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/79795004983.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/42152219244.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/medozebofugusevigimusa.pdfIn PDF document text
    • http://pronobile.com/catalog/file/xuxigejekivabu.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/75426083828.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/putesoweziluxup.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/tazuporafigigitu.pdfIn PDF document text
    • http://djpress.pl/Image/files/60135423408.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nerejutowifidizosijul.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a62d873e---saxetunaw.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/28823425455.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 18012 bytes
SHA-256: 0e6479a194fd52195145ba71d295666f81e3a1f1a590bda9cfe475200fe3788a
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 10584 bytes
SHA-256: 609feb8bbb09adce18c843e113eae52771ed79b65cfad71bda477626ec732033