Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88e0f46895a87f6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 05:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6953b3570640932bab0938f5321b446b SHA-1: a503195cd61f3f4718a5d67c3db04c4de99fad97 SHA-256: a88e0f46895a87f6fdf420023056077437722892dbfd887b34f55027d53ddfb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://accapierre.it/userfiles/files/27587338966.pdf In PDF document text
    • http://dj-venci.com/uploads/pages/files/66811352749.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vuziban.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tavufejetujobu.pdfIn PDF document text
    • https://umutfm.com/resimler/files/35930775248.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ritaxovojodofuxujaritefe.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/varanikoxemizidopabemiti.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/xutowekuziraxekuzo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/larojurekotivexumoxeput.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906102836.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/janivojenikulinixedabala.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/gomobawidisumazepib.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/18853679392.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/dudumurar.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/57328645800.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140624464976.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/63138033724.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/19688632587.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcdb8fe9b---getezebib.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108312054517600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+5+online+play+now+free+on+laptopPDF 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_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 15960 bytes
SHA-256: 1a912effa6a668516f5dc7fd92576f65b9636c40b8ac852e1cf60da2845ef36c
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10556 bytes
SHA-256: 3182a11cdefe3a6574c36dd14a5e5b43266d3e82e010731cd7d94a9706fe27b9
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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