Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c82ba8a4169e513…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 07:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: defd7a78934ef9d3b30c70375378e220 SHA-1: 8509b20c58d297d4a7b3c038bf7999f66b783901 SHA-256: 1c82ba8a4169e513e35331a41f72c1d7804b72cd8d03455ea3339bc7e1a9cba5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high number of distinct hosts and links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5042

Heuristics 4

  • 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
  • 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://lawyerupsmart.com/tempimg/file/78878275699.pdf In PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/74809973413.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/14285258007.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/47344480722.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/62236214549.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/zevukunativijamo.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xusitosedabifijufito.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/nisodiwiwedoxerava.pdfIn PDF document text
    • http://unityproductions.com/upload/files/titojomaxidajakugatekaje.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/12282569246.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/2201227898.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xinati.pdfIn PDF document text
    • http://minerva-collection.net/files/files/34635124974.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/50626136199.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161437c51492cc---48459873442.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/76538954351.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xupisotidarulonufese.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/64669519243.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/16533406736.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/sizogote.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61272702611.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/70067079256.pdfIn PDF document text
    • http://soupworld.de/upload/file/78230464164.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/kezowuduxifadutereligojas.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/55162216955.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/90100552084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=note+10+live+wallpaperPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10276 bytes
SHA-256: 3b4aacf7b7a7e6016c2e5e6ed28630fa651fdcf157b3cfa02962cade296dbb55

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