Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ae2e62f197a8e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 11:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ae0c9166f10207c7625577c34b68b57 SHA-1: 664f5bfb127775cdb76a29cc6f1d5fcc10fe4301 SHA-256: b16ae2e62f197a8ed9dc5889bd3e4b3538164a5d220c280c205eae33bde3042b
126 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dreamscapes.ca/dream_scapes/userfiles/files/xelipogovemob.pdf In PDF document text
    • http://kapsalonindex.nl/images/uploads/rosubazuturozeviz.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/latotixuforojiboboxe.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tomoloduzubikade.pdfIn PDF document text
    • http://allasclub.com/campannas/file/bufalorotalerek.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/53025274256.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosajifitonuvonabudaj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2g6t922j60jkvao7arhlerksh4/9295433698.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/55186859431.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649d10f170---97207494428.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/xewumipimotovobalilivu.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/82618101011.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/luxekajavusekemek.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/fedisatel.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/tugivekose.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/663694601.pdfIn PDF document text
    • http://coachhouse.info/assets/file/99950271353.pdfIn PDF document text
    • https://robodom.si/files_vsebine/73026567838.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/88742757990.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/64488395316.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/gobaxujulezadusebu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/givenigurutuwusovujokino.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zikeluwomulowosabodar.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/nunulevinokiximop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+gbc+games+downloadPDF 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10744 bytes
SHA-256: 0117cd11335d916a485ac446bcd79cd8016ee0ac132371750193786e0a7c6790
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 18116 bytes
SHA-256: 8809b1e9a5bb3b1f6262c234f7c31397cf118fc6c05abda6af3c435ecaab1806