Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3e35cdfd72fcf5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 11:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f615c74d2bb95eb60ac866f8be177f SHA-1: c318e538b8ebbd89bd1e423df984ea1e865f565c SHA-256: 7a3e35cdfd72fcf54b342839fcddaf6f2e924b0c619d164968183a1c14221d55
134 Risk Score

Malware Insights

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

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 0.9977

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://zaintik.org/files/galeria/files/kaxenufedufokizibe.pdf In PDF document text
    • http://cpils.com/userfiles/file/manezovogokodav.pdfIn PDF document text
    • https://mklaassen.nl/images/file/88536287320.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/45637240276.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gurinawefofudivis.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/47891116575.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/kukosevoxewinupejeriwi.pdfIn PDF document text
    • http://skncn.com/u/files/50107169959.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/95435123200.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54165755696.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/gosuripodiwelabux.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/nenoxaralewemujuselator.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pekuga.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/ziwigigarenodanerajewun.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lapug.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/43050521050.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/50389260424.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/3409420210.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f9a0d4ce---94303969891.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21528925696.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/61656349081.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904001955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+stop+chrome+pop+ups+on+my+phonePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daxewinunarojopeko.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 18460 bytes
SHA-256: 7d8bc099d212dd629fba33c33829d9bc530ac997e9a765261105c1ebb6e53a50
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10632 bytes
SHA-256: f94e48eb08b241ebd4b9c078f8cd541125327346a74756a9219e368a71473cab
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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