Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ac664419bccfb3…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 08:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3552731ea195ae4185e9ee93a061b14f SHA-1: b939fec766da8aa75d7a9e1f015934f93e1d3e30 SHA-256: 92ac664419bccfb3d4aa82ea675f03a92a1d65a7d14f397bc00b458760939550
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, with a high probability of being a phishing or malware distribution lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to potentially disposable domains, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elfobchod.cz/foto/Image/file/tifazanumizekavifidegu.pdf In PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bipanomabanur.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/33335653427.pdfIn PDF document text
    • https://mkart.it/uploads/file/92649742597.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lijelapaputuvutenifun.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/runub.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/matixe.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/79631027402.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/zejetuwuverikoganaseka.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/64392750893.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/50217998805.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/26657730232.pdfIn PDF document text
    • http://abc-tel.ru/data/File/runujekejix.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/25338832703.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/fakibisopagofowuxujom.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/takoporuvelapadixobej.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/rebozuxufeluju.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/todufinixenizu.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/34516738676.pdfIn PDF document text
    • http://iucecb.com/files/file/solubamedad.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/taruzogubi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xukuzode.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/pemomagejikozesojozoteje.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/34596018859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+to+take+for+a+muscle+strainPDF 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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 16784 bytes
SHA-256: 45032745c51e75cc4dfa0e409f2e403c1332f75ff2b9212d98e18006eb8b0ed6
font_02_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10788 bytes
SHA-256: db802e608775346503bb7d6e137310f66f0a00bf84c3eecd4049d49a5ef13b68