Malicious PDF — malware analysis report

Static analysis result for SHA-256 57675b876dd1c710…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 23:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60457ca44f56343116da19fbcaa6aa68 SHA-1: 7695445d5feb66ca5f035ac54b1b0c88183b3585 SHA-256: 57675b876dd1c7109a2aa752d002bf352f8a0eb8a0ef79dd9b40c6ee72a40f0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://techscreening.com/userfiles/files/welibevitazufanulametari.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/talobisogugudav.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/libuxekutofaxulabul.pdf
    • https://glozorcom.merlak.ru/userfiles/file/47002654343.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/tewalesixigotesimilo.pdf
    • http://bidwoodmachine.com/d/files/25217070991.pdf
    • https://cuatudongnhatrang.com/uploads/files/67107096945.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/38573088530.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8f3ddccf6c64e185a989dbe6737dad70/jarerigizilunegatodomomok.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/98942764787.pdf
    • https://megacook.pt/site/upload/file/2864539082.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f76c5e8---29253196194.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/fovujojazamogipo.pdf
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdf
    • http://ccforum.kr/uploads/file/1631037863.pdf
    • http://violetstudio.in/userfiles/file/losavifokov.pdf
    • http://emrc.ie/upload/imagecontent/file/somixararozal.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/jogelifelabifimiki.pdf
    • https://drjou-vc.com/upload/files/labotudaxuzejijiwenataj.pdf
    • http://jiangsutravel.kr/userfiles/files/20210917_135327.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/givesotegib.pdf
    • https://e-midas.ro/files/file/rudibodedezidilisutawadi.pdf
    • http://cnmrobotics.com/files/files/55904287222.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/xixorilaralamoresetoweza.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=windows+10+latest+version+download+iso+64+bit+with+crack+full+version
    • 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_off0000bfe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 16792 bytes
font_01_sfnt_off0000d7fa.bin
1f25fb9b457117c2c8e97efcfe47a6bd0a7f1d3984d2fa0e2d20a516ec089ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 11468 bytes
font_02_sfnt_off0000f325.bin
6ced619d02917591c7fcc53a4f4bd7fe820a59192619df4761f7870c678917e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16248 bytes

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