Malicious PDF — malware analysis report

Static analysis result for SHA-256 89de04336c1c17f9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 01:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeec4549dd42eae7282683554f6d34a7 SHA-1: bc213d710ef16171f23fa251d3545d623d87beea SHA-256: 89de04336c1c17f979263cda8e0c3c459d8fddbc990482b7bb0f6ebaafca5c1f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://namdolove.com/FileData/ckfinder/files/20210908_14E2DE8968E83FFF.pdf
    • https://reparation-mobile.net/userfiles/file/41251487502.pdf
    • http://esteel.my/userfiles/file/27657361484.pdf
    • http://stroytehcentr.ru/images/file/fajawokakixudojatib.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/75471288503.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/42727330059.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/64635442696.pdf
    • http://eamenfaraz.com/cache/fck_files/file/64605656140.pdf
    • http://tinhdaurosa.com/Images_upload/files/73806244412.pdf
    • http://rapet.hu/files/zixogipikimorewosizolat.pdf
    • http://fu-xin.tw/uploads/files/202109041553548918.pdf
    • http://myphamlulanjina.com/upload/files/rafoxadixewetorovabu.pdf
    • http://www.scsk12.org/policy/files/files/vuzesobirumafejomeguku.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/diwolarixarapixum.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/dojedi.pdf
    • http://olympusflights.com/files/files/90283818747.pdf
    • http://iraneto.com/basefile/iranetocom/files/38674039534.pdf
    • http://sevvalturizm.com/rsm/files/73317715242.pdf
    • http://auburn-properties.com/userfiles/files/30649122418.pdf
    • http://creationart.hu/files/file/dasoves.pdf
    • http://ttfi.org/app/webroot/userfiles/file/refumanufedibesigilu.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37789035005.pdf
    • http://btfa.tw/upload/files/95086510656.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chal+mera+putt+2+the+hit+movies
    • 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_off0000e3b0.bin
0a1f4dafaccbd8a8bcc6ad292cd55c6f51759740e7eb373608185f0d553d2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 18788 bytes
font_01_sfnt_off00011404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16792 bytes
font_02_sfnt_off00012c1b.bin
e5affbecb20897dbdae970d8c58a654bb4b422bccdaba9396f4452b7154ce1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 10728 bytes

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