Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18933636f23008b…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 406213248c96a9ec0aa53967c8a4646c SHA-1: 9be525d23c9fc7b9effd9ef5a773c1c9ac998f81 SHA-256: f18933636f23008b00a2eb866cbcb5dd8c0776475c9b0311ec8a841560178988
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards a common pattern of using malicious PDFs to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=transfer+files+app+android PDF link annotation
    • http://shop-exclusive.cz/userfiles/file/kijujonaxipofugu.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/46540135952.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a42cbcf6---17054857559.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/85542414304.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/62358275789.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/88686664813.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/javuwisi.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/25396450197.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nevukifufelugo.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wikoxexegagopom.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210918_668ED93BD7DD6E35.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87876945323.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/38621847728.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11938700181.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/monivodizojununijupodexof.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/25664555470.pdfIn PDF document text
    • https://migger.dk/userimages/file/lovuto.pdfIn PDF document text
    • http://slsnn.ru/content/file/69168060202.pdfIn PDF document text
    • http://remobudostol.pl/pliki/rujupubuxitowufavilotu.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090620205364.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_off0000aaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30B 10356 bytes
SHA-256: 88b5035a8bf72c7a3faf22494ee8b238a0f4a018c96b10877e3ea767060d9343
font_02_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 15712 bytes
SHA-256: 340182c98b0694be0503b771d633dbb6a0fe170fff328fb545e5de7daab6adb2

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