Malicious PDF — malware analysis report

Static analysis result for SHA-256 343c706fddd26fa9…

MALICIOUS

PDF

69.1 KB Created: 2021-10-06 20:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33de844f4a50eb30d2c90db71c4d4216 SHA-1: 8736be8851007176da803544c76779b0402382d0 SHA-256: 343c706fddd26fa90bad7ef991e2af646f8d001cc62c88874fd3465bbecbc7a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://huntic.ru/uplcv?utm_term=old+town+creamery PDF link annotation
    • https://vmwarts.com/ecovic/file/96890185301.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/gebatapifenokuzojurizuw.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/22310652882.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kivazuxolerobodox.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/12405643474.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/883766435.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/xinovizisivofifu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/35578800160.pdfIn PDF document text
    • http://rld-carbon.com/file/49036800239.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/62760858794.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/77263085695.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/93709498058.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/42210013072.pdfIn PDF document text
    • https://pellevah.com/upload/files/61672944546.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/kunabona.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/nazaragoguz.pdfIn PDF document text
    • http://beta-rc.com/upload/files/65185559438.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615303ddc8e03---norikizowovebekoliboludu.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/89571043004.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/31976930436.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/55572663829.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/834981227.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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 16432 bytes
SHA-256: 30325c3c6fb37e21d1867c82df3cd61e202790d1bac2cb22d9eb206df1627e9b
font_01_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 10496 bytes
SHA-256: e0162962fc82b3c46366d556ed0bdf383684658b78253c085b4ac80cc23e37eb
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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