Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e4dd921a2d7722…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 11:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 061c0635b73e33fac5ab2fe9dfae01a1 SHA-1: 53ce53285ee400d54f0ffe2ba55865fbe6d7b708 SHA-256: 83e4dd921a2d772221c71eb39bb207128ec56d17bbf2c8ce0903a967ced129f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL distribution suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiofagiani.eu/userfiles/files/lawogubotenisu.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0277b18b---20012312926.pdfIn PDF document text
    • https://datenglagi.com/contents/files/divapudusakopo.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/67356310327.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/93140527147.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613181e56384f---berexarazametelimiditavuz.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6332869510.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/jivevuwalemomalazew.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/58003298589.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tigavopovikigepekadak.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/87949869524.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lidofowe.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/xewepakil.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kilisizu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/90627585449.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/jurubikemuvuroguxu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/64299004044.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/5501315943.pdfIn PDF document text
    • https://digireg.se/upload/33177580748.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/muwamubevexe.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/dobedajewemute.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/zevejujemam.pdfIn PDF document text
    • http://mega.kz/media/upload/files/jiruxujimudidigakopob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=micro+office+365+loginPDF 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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10548 bytes
SHA-256: 4f70fdd5747fd869bce0c174e4938a23698fd02f76d3e14bec83a7df5c5edf5c
font_02_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 17296 bytes
SHA-256: 3e555303e3504b55fd3792efadd51a59de9d25caa3a7c6fa2c3b5999e640a2c8

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