Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa18abeef5fc892…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb87bae22bd1c9012e419a002e2af73a SHA-1: 45f6cce6d54cb0ff847517b5507092ad89e8a8df SHA-256: dfa18abeef5fc89201f12b0b86e505cb34be61a9d5ec699d3329d96c166e9cd1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a deceptive purpose. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://phuvuongcorp.com/luutru/files/61539555770.pdf In PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/29737225029.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/6710990459.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/mugujefetoluwedefet.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tegogid.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/40533761765.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/67138498671.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/37607699067.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/65154798968.pdfIn PDF document text
    • http://belloverde.net/emailer/file/90226604926.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/75088454611.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109050645244655.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/rizekatibuzome.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/tajugizixetaxez.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/89628775813.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/1770996802.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/41512829585.pdfIn PDF document text
    • http://epicridesnepal.com/files/fododuveterivolibixalike.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nitiximutekekuroxubudirom.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/tawogelukije.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/603fb23bedcae4ab71e3de443736c732/gakolilifo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7c39aeed---vavusimabibolakoseze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=crash+bandicoot+threePDF 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_off0000de3d.bin
8376964a320d5b62436b4b4fa0a7118b7ffb1ae52dd3f8af23566d2f87ef4ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10592 bytes
font_01_sfnt_off0000f665.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16792 bytes
font_02_sfnt_off00010e77.bin
3408319cf13a89304eacc0331f4538374a25aec861b237a618abf7dbf1e8a17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 17160 bytes

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