Malicious PDF — malware analysis report

Static analysis result for SHA-256 2772df5c917a459e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 15:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 487f7013ddffeec067105857143e8c83 SHA-1: 2a7df36514744b00cd5e7730748dbcaae9b77d2a SHA-256: 2772df5c917a459ee116c466c39586024159c382d83277422e8fa7cd208f1bd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rogersdesignhouse.com/uploads/files/bovetevilapapefilabusovo.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/18902673296.pdf
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/rixilirafexu.pdf
    • http://ebd.su/UFD/7623/files/42843336036.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/boxefugigibibofulodonuwi.pdf
    • http://straps.by/ckfinder/userfiles/files/81289761104.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/97800850793.pdf
    • http://celcg.pl/uploaded/file/29460256612.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/pikalirok.pdf
    • http://elma-itc.ru/!upload/files/61974747949.pdf
    • http://dautuck.com/uploads/userfiles/file/23884742761.pdf
    • http://ouhkpthaa.org/userfiles/zafokutelijaxusozukeronat.pdf
    • http://vinhthuan.vn/upload/files/47838717280.pdf
    • http://mesterteto.hu/userfiles/file/rizekatibuzome.pdf
    • http://giaydantuongphongngudep.com/images/news/file/nixolaxefis.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074a1dcaa7---1458070969.pdf
    • https://ww150003.linebot.net/upfile/files/20210910125909.pdf
    • https://defi128.phpascal.com/userfiles/files/dijovufekilesigomar.pdf
    • http://ulv-fogger.es/d/files/kefuwevesanajozuv.pdf
    • https://bankubezpieczen.pl/userfiles/file/xogufijoturevarijikas.pdf
    • https://konzolstudio.ro/uploaded_files/file/xinukirupeve.pdf
    • http://myphamlulanjina.com/upload/files/49233374679.pdf
    • http://ggmtc.net/userfiles/files/narodode.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lightroom+urban+editing+apk
    • 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_off0000d571.bin
cff4a3f4594934be512d89c150e71fbce2c4919efc45a35706fa76c5fc65ae90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 18080 bytes
font_01_sfnt_off000104f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 16792 bytes
font_02_sfnt_off00011d10.bin
2db8f112cdad5a8a42904341306deedbb08f07c775c4a33a05d41840e8f97fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 10916 bytes

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