Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc80fa0683aa111…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72423c0124f4e8bc1b21c8e0b93e5dc7 SHA-1: 27f6624c5ba269c8208db9683ecb866d60eadefa SHA-256: cfc80fa0683aa111a4c32d890ef2e9069d571c2d98a296d6dbd371c15ef146c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://edouardweil.com/userfiles/file/86006003643.pdf In PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/47575289799.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d25346e14e1970b96b67a8314c456a9/66800434781.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/84815978964.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/kobunenideruxat.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/wosebisosupisajelomewaj.pdfIn PDF document text
    • https://aneri12.cz/res/file/zemexiromiwuvujexunitu.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/25736618124.pdfIn PDF document text
    • http://hmed.vn/upload/files/kizexapatobefifunijiten.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/56870346935.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/wonagafut.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/zogulegokomatidejaka.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/parufidetiposokerati.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/rusarifabuxasugobuzobilam.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/83127750227.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/titixe.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/73891009309.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/85622916957.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903130110.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/42049836010.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/laganixofuwarigu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pemigokiwinenosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=random+online+chat+omeglePDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 17504 bytes
SHA-256: ac63ea1779a2783debd4c38b38a204d6f1f9d735c6c560308aaa6d5fb55129f0
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10592 bytes
SHA-256: c2704d528f9dbdbb16a6b3ccddf9259fe43150c67c7114efefef71ebc376ace6

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