Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d668ea46b1e425…

MALICIOUS

PDF

94.7 KB Created: 2021-09-08 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0b64cd47c05001751cfec071cd4ef8ae SHA-1: 78da3a9799d30fdab8732c8a2c724ad9c462fa61 SHA-256: 43d668ea46b1e425ac4f696720860749e6eb8e32d5db1ca7f91821773f6914cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bsinteriordesigner.com/userfiles/files/zurumavomepo.pdf In PDF document text
    • http://pickup-ws.com/userfiles/files/68612319770.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630643110.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908031434.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/bosibudoj.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/lajuwesatuxuzavepekewosar.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/rozuvobi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waruwepixip.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/domavuzalevax.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/49208675179.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903114917.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/82097099750.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/47935455934.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vopekifabedo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/88609751417.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/farevanusonabuwel.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/25391654117.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/96398289077.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/89073740738.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36818343796.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/novavuvesegegudide.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/90853765248.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/92451614633.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/96626799262.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gewetenofujipeju.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/sesewuparukulomipimu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/lizunezemup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=thin+film+solar+cells+thesis+pdfPDF 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_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 19416 bytes
SHA-256: a986c9a117dfc0ae1107399b35f9bae65fea48b050ed30b69c47e08cdd6b7f68
font_02_sfnt_off000153ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CE 10848 bytes
SHA-256: b63b6251e271db530a8f91498eb23a3ea6105bb347d2221b425c94d2975c7eb0