Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83fdbc8c7748ccf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-30 12:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c40c2eb2c66320a87fff6926bceba78e SHA-1: e4a97861c8a7c550b9feaf82b64d16750a88ffc8 SHA-256: d83fdbc8c7748ccf34a9ba992ba69b35fd0b615dfd22a2a9db9f401bab149090
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of multiple disposable hosts and UTM parameters further supports this, as these are common tactics for distributing malicious content or driving traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://jcnjl.com/userfiles/files/63249997779.pdf In PDF document text
    • http://kraski-chernila.ru/resources/file/kelokiwodowoverusa.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/32175616108.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/21784820808.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/98092232707.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/vegepizuzopufaxak.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xijazir.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/19109170619.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/bedexoriden.pdfIn PDF document text
    • http://biomehl.com/images/content/files/40852880020.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/76831237794.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/kuposamu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/96753070151.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/tovexebevunugi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/58946478417.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a341758b43---57163820575.pdfIn PDF document text
    • http://floramarble.com/uploads/71949709014.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/99996744872.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109170813114965.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021092623440557536.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/xininivudul.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vuxibev.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/94734269346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=smart+view+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB637 10424 bytes
SHA-256: f41ed3a658dc4d2350d071ebafa5bd12ff6cd2f1b52f71feb2f80f496ce24b58
font_01_sfnt_off0000cde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 19804 bytes
SHA-256: e1c8d04cf00783ea18e17e0d77aa3fd4ee3f6ed0a4180305ad447109ceb73c61
font_03_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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