Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a20c1020bc4400…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 00:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0a214962860f9fb1548756ae4ed9bae SHA-1: 392bd0a674f4a64f8f9d7701ef3922c02fd70b04 SHA-256: b5a20c1020bc4400d33150b1a0ce4c869af96bb4da7463304d8059ff44d74ffb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. One specific URL, http://thayloilocnuoctaihanoi.net/upload/files/wevusaranumaka.pdf, is identified as a potential link farm, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thayloilocnuoctaihanoi.net/upload/files/wevusaranumaka.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/25165886205.pdf
    • https://cafesca.info/ckfinder/userfiles/files/xiresifusevuzavimuxu.pdf
    • http://anninh247.info/upload/files/15276031223.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/karudamulinofupisarofe.pdf
    • http://ventima.ru/userfiles/file/ragigetelujekupugun.pdf
    • http://pytextiles.com/userfiles/file/momejulatokufusek.pdf
    • http://www.agot.pl/upload/file/74517400018.pdf
    • http://soc-in.com/data/media/files/19357934479.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/51143151597.pdf
    • http://mikllc.mn/uploads/files/38253261914.pdf
    • https://latgalesamatnieki.lv/files/file/46537036738.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/togedopogubawowirupep.pdf
    • https://maria-galland.ru/files/file/97459499965.pdf
    • https://insolite.lu/img/userfiles/files/bijaremelorebaloli.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340517b2f03---bafevifuriwu.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/63916365228.pdf
    • http://udokutscher.de/gfx/userfiles/files/85617224896.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/xuzeperuvisitu.pdf
    • http://1qjd.com/upload/files/2021-09-12-19-51-59-j8snKJKe.pdf
    • https://synodradomski.pl/userfiles/file/najuzejevarajokabog.pdf
    • http://k12kos.com/ckfinder/userfiles/files/7479866507.pdf
    • https://nationalshield-uae.com/userfiles/files/13828380202.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/68949576622.pdf
    • http://www.lircai.com/web/inline/file/33577286366.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=spanish+verbs+that+start+with+m
    • 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_off0000dc56.bin
1f97103538b0307abcfea73c55d00e85275fabe8cea4b257029935bc439dc83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 10720 bytes
font_01_sfnt_off0000f49e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 16792 bytes
font_02_sfnt_off00010cb0.bin
bbce71447bb2d07ec9a17396312306f085699b1a808cc8fcabe416b83384da2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17876 bytes

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