Malicious PDF — malware analysis report

Static analysis result for SHA-256 40adcd9fd8823cd5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 15:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0ead9185ee22dc2ab49b5bd829d29e6 SHA-1: 2a9b009c353d97c10ed42d26ca9d36c3850349f7 SHA-256: 40adcd9fd8823cd53a35352d21adf7339e470e5bd3f7b74473555123789ac4ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://chcial.ru/uplcv?utm_term=program+do+tworzenia+muzyki+android PDF link annotation
    • http://bajajsports.com/userfiles/file/57851415783.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/wagukasovabelev.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bitavuwewimejexobededaliv.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xibenow.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/tamazukejukelosadobiwe.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109131300597668.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/20189543442.pdfIn PDF document text
    • https://autoskola-scp.com/files/58577282888.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/422597739.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/97449772178.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c838466f29---sifanuwux.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/jegalakijijagajuxapafezi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63706075486.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/verijefazebejodenulita.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/jajelusujixozupu.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobilapilijewozetin.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914005612278918.pdfIn PDF document text
    • https://apra.pl/files/file/zukonulumezubezo.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/68187621949.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/dulenemifati.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090211477587.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/81176564652855516cbfa44463dd6f3f/kibamefizujorozo.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16288 bytes
SHA-256: c9836f231bd9e84c7145a82c74d248963ad9294a208db54e667fd28df33bd857
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 17972 bytes
SHA-256: 85eb078eb382229117edd8645781c1246747262ddeb7dde7ac7331774ea8af07
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 10832 bytes
SHA-256: 93cbecb92a1660589f3e0724ddba88d2b92f9b47c9cdcc8705122dfca5a02163
font_03_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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