Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e4f2d43d64d6c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 08:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad124d0f13e1aace274c275c0d904b43 SHA-1: b1d07fe43943f4625ead506d3ab90662e99f40ef SHA-256: cd8e4f2d43d64d6c2e5fd4c62004ac85899eeaa145effac8e98b3ba793a5aba0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or redirection mechanism to host a second-stage payload. The ML classifier and ClamAV detection strongly support a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://holyfamilyhospitals.com/ckfinder/userfiles/files/xuxusopekipas.pdf In PDF document text
    • https://zohopin.com/calisma2/files/uploads/fukomipudadaxeji.pdfIn PDF document text
    • https://majubesar.net/contents/files/nesosuravadavabigef.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/7050413133.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tinevivamuwafufo.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/dalajowezigimasokekib.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eace335e99---sinajinotubo.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/ganesofemorekemudelabev.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/19132555815.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bbb59be7---96441714519.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/botezeb.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/37627046556.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/kiduxarisop.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/36394102694.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/dovusuvukofawotupiledagi.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/99405573691.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/18355137720.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11682599280.pdfIn PDF document text
    • http://knipia.com/userfiles/file/24453549774.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/90415953106.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/lipevixenuli.pdfIn PDF document text
    • http://nature-revive.org/files/file/tamipoxugifikixivuxenav.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/2729115534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+pokemon+monster+parkPDF 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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 18260 bytes
SHA-256: 9201f4f7aebb8e34f276fd3838e768b187b836837e115d3e77403d95380179ce
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 10640 bytes
SHA-256: 7083233411bd4668846b2f3add5cbedba9667834676176a381d554cc98f710a4