Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b19d056fda348b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 09:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 555359d3b2f5e8ffbef28f4e64e03a76 SHA-1: 425f46316a37cbffc022013a0ff67cbb08ce4c86 SHA-256: f8b19d056fda348b7eb2d3bcca3f05c580b0563e11d8c73dd0750fb389ed5726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggests it's used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://santamariamikado.com/uploads/files/raranuzigimibo.pdf In PDF document text
    • http://fazekaskozpont.hu/images/upload/file/52085462480.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zivilujom.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8c2f696---82904843531.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/nuwijitag.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/jiwogoluvol.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/85704306227.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2102023902612fa67ac9516.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zetikakuxona.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/19062074103.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/belenanaseponasokejiw.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/54946188760.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/nezunujakexaze.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78070618140.pdfIn PDF document text
    • https://clickbox.ro/images/file/88877957689.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/25652002053.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a1d399cc9dcd5da12b91201e382f4328/xililirikev.pdfIn PDF document text
    • http://xhzhengli.com/upload/kisomepawugimifos.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1630713044379.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/18380453201.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/vewuluku.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/modupejofuzaw.pdfIn PDF document text
    • http://tiquital.com/documentos/file/fojefibanaxiw.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/41815008095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=setting+up+kodi+on+android+tabletPDF 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10804 bytes
SHA-256: b41de52bec6f8d484ac36976f23fd29c7a68a1d0e4da0c247fc597b16482bd7f
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 18716 bytes
SHA-256: 57774bf598eee57d86d89c337caa40162a4e2e1ba739b07ae49346c3bcac96fc