Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd8ac282e3ac506…

MALICIOUS

PDF

75.1 KB Created: 2021-09-27 23:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4982e24054ceee45ad156d534b6f2006 SHA-1: b0f5fa92db653d28641cc221cb01f35b97750689 SHA-256: 4bd8ac282e3ac50683a4d598472a6ae00ce5dae57dbdb61402383f7ead6d8d0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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
  • 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://6nergy.fr/6nergy/sites/default/user/file/78819182917.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307041837.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae991bfb5e---topulomasegekojamibuvotik.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/wagan.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/kiduvokekeju.pdfIn PDF document text
    • http://bushurov.ru/images/files/navad.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/42076985543.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/71526983512.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/15637969623.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/tufovusalomibegijafa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/73457180021.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210923000355_766226062.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/89055362973.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/25897646183.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2subafogv53lq0u5vvs1nio685/molasivaw.pdfIn PDF document text
    • http://alcantara.cz/data/file/sowufetarimu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xuvefukabuvakudozebazisap.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/netajarigolefijuwimumage.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/30844243551.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/9009677957.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/88501549930.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/ruzavibopej.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/refegomer.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/77092488669.pdfIn PDF document text
    • https://tonitomov.com/picture/file/damopexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+power+of+your+subconscious+mind+in+marathi+pdfPDF link annotation
    • 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_off0000ba0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0E 19160 bytes
SHA-256: fba64c9d4c0022ead7b1f08c5d62a68c39b22badd5e73f930f7c8a8eb8e91a4a
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 11240 bytes
SHA-256: 8f10a8802fe6cc5e4afcf4ddb1ad761268b1a2d8e7c03d36fc01e1ce41429ee3