Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c93b7f7efeaf50…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 01:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27fe1004bbfc36c98aad7d270e78f5d6 SHA-1: 295f51b9cf482df4ad2defec24a138f9cbf0ee64 SHA-256: 44c93b7f7efeaf50b1392d72e2550025ca04c7405de41539e4c297200ef64c0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to distribute content, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged the PDF with high confidence, indicating it exhibits characteristics of malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=investment+valuation+3rd+edition+pdf PDF link annotation
    • http://zjleiou.com/images/upload/File/77071599545.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/disubej.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/33017386805.pdfIn PDF document text
    • http://dgjst.com/upfile/file/94277117023.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/73673960417.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/28329601019.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/96516364765.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/50734871827.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/lukiwosuredatujugapaje.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9f93ebf3---29181249598.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/15680397739.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/74314051609.pdfIn PDF document text
    • http://cecev.com/stockages/files/58748702682.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/melibiveninebi.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/22748252211.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/97435986580.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/ninotaviles.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/56915689843.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/nekurojopexesujazik.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/99505859585.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/66561795747.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/33895142698.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10948 bytes
SHA-256: 26a57c12988c3c41457d276c4e5390bae49b2a584b2eabe817f752c66ef4fdd1
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 18036 bytes
SHA-256: 542ae551e5ac5e1d156fd8fd8c6cb0976f7a422f9195396d66b5749f46a905b6

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