Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5784c14f6206a50…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977f8ed428deedf3e39bf2a88af98965 SHA-1: 27e9747002bf8ddac798f38b36a5acd4619801c4 SHA-256: e5784c14f6206a50f7c9e4f90be6500c8b0a2baa13b5e81948aca6f398cbaed2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=baby+driver+full+movie+live+streaming
    • https://euroialinsol.ro/userfiles/file/fagadarati.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/45280266629.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/fukazus.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/masusovufosopizig.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/pigejejuke.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613341bd2c579---86485976527.pdf
    • http://sinners-party.de/media/file/17415457675.pdf
    • http://zhfangyuan.com/uploadfiles/files/butagugufesivoxajozidag.pdf
    • https://erdenetpost.mn/userfiles/files/1793127759.pdf
    • https://tenderdiary.com/ckfinder/userfiles/files/21590417009.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/getovejaseg.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/90285021301.pdf
    • https://nomortiga.com/contents/files/61381591469.pdf
    • http://iviltra.lt/images/files/49102631513.pdf
    • https://laznia-radom.pl/userfiles/file/mitidav.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/61640987631.pdf
    • http://dasbluemchen.com/gubonepatonu.pdf
    • https://makojudo.pl/zdjecia/fck/file/69552039340.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/45032184291.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/t36fli8fs6c9th1engjfjmru82/wogojikilurevotij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad11.bin
14e18459325288bb2fca6b6b0e1028d878d7dda2b2f4e17e7c7c459b882ce924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD11 14752 bytes
font_01_sfnt_off0000d272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16792 bytes
font_02_sfnt_off0000ea89.bin
7277bd4ad48deaa8cd22dddde92300e205d4b9a405161b4d92d006921312d3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 11172 bytes

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