Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd142bdcf1509cf…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 285e93f2f737da85e6d5d466bfd0ba36 SHA-1: 414baada8355420c92c064eeb38e8fd367ce6b64 SHA-256: 3bd142bdcf1509cf0a288640306be7b2bc3a0917e07fe0598fcb77b84ff8ed55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=apple+ipad+9.7+price+in+pakistan PDF link annotation
    • https://appvid.eus/userfiles/files/gotinon.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/nipudopexobapewadifa.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/48886578672.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/bofitid.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631845521.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kekifiwurinuketatosubi.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/zegedebizatulubed.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/zonen.pdfIn PDF document text
    • https://pepsima.biz/files/file/63171938398.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/xenijarix.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/guxomaruroturovabutu.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/96552703686.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/6852964704.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/puwogibuxusinidabasixamaz.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/94305925036.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/55701162858.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/modajotesivoxebuluxubabo.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gemawe.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/jupapekixo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614040ed3962c---68907538269.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/49979887562.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10804226001.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141783a310c3---xevopivuluminadosukogaf.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/71053240252.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 18236 bytes
SHA-256: d9a1beadcb361203233b0e80843c51e6d9e6644f7264d10e9a62d8bf4930e69a
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10744 bytes
SHA-256: 330252012b0c161fef3eaf58806255267f8ea178900c0dec52f8f9fcd70cefbe
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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