Malicious PDF — malware analysis report

Static analysis result for SHA-256 52357fd9df04c1ad…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 23:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb55853d430d404f3edc2140acae6a01 SHA-1: 93e3487974031e4bae7b6eba718f19ff36a3979b SHA-256: 52357fd9df04c1adb64642fa8bcc32d6198145a260091e28c1e9929c5b75cf1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that lead to other PDF files hosted on various domains. The presence of 'utm_term' parameters in some URLs suggests a tracking or campaign-related purpose, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://crysiq.ru/uplcv?utm_term=heroes+rising+eng+sub PDF link annotation
    • http://www.urbanwaterways.info/files/nobesunidewugesinebov.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gitijadixuxapa.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/23932695704.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/15755700447.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/xaledapazomatavedu.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/76795565269.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/memibolanobituw.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/30840149289.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/pugajabuno.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jaxofuronevojevitimu.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/ripas.pdfIn PDF document text
    • http://kaies.net/upfiles/file/nudugubusonad.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/53565076314.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/punutev.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/xuvoviwavapakinezu.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/55592947298.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614720ef00272---bunumafuwibilowilasaki.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e139d1025---15241725865.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/wamidutu.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/36884295574.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nuzimuwotefogirapizab.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/10177574890.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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 19116 bytes
SHA-256: 22a2b30519532f811a2079bf47dce3daf6b0fcf2ce899c46e8856477d1df679a
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 10208 bytes
SHA-256: 9bf89b4c49aa523355a0dc1f178f907837c180f0045cb25acace7d2d698558cd

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