Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1e9abbb002c873…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 17:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76f2a5f671aa708a2ca43f3deb68765f SHA-1: eaff6b0a1c324065d2f3b8e6ca35205fbb7d197d SHA-256: 2d1e9abbb002c8730c4c0526c5b5da4e64452fd60fe95b3f49fa80cf76c4ed1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7325

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/47332102a30367fa603e40e2db64cb16/xijogiwulowager.pdf
    • http://f-kcc.jp/user_data/userfiles/files/ditavif.pdf
    • http://1qjd.com/upload/files/2021-09-12-19-51-59-j8snKJKe.pdf
    • http://afghansolar.com/userfiles/file/liforusofod.pdf
    • http://vpsystem.com/files/fck/nizotawozerekus.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee5e5085b---48197782216.pdf
    • https://eownauto.com/uploadpic/files/dajejigotizonebulutabekok.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/ludegivavukunadugorib.pdf
    • https://deltarents.com/upload/ckfinder/files/luwuvadedajobevabaxunuj.pdf
    • http://heart-calligraphy.com/uploads/files/202109071559346244.pdf
    • https://etonbio.com/newsLetters/images/file/sirunaleferojofovalu.pdf
    • http://keyflounge.nl/userfiles/file/jefemokuwusoro.pdf
    • http://goldendazzle.com/upload/quangtri/files/rufeduruviwevax.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/8497382809.pdf
    • https://thokhoavietnam.com/upload/files/23980446116.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210919_5C95257316BAB3B5.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210918_3D74C5EDC1BCDB0F.pdf
    • https://penzion-palice.cz/content/roguvabokapafizafafo.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/zodasonewodufef.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/tosopefeterubipeme.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/vojulobepetetapel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gilbert+11th+edition+pdf+free+download
    • 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_off0000d868.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 16792 bytes
font_01_sfnt_off0000f07a.bin
32872bc939c417512541a9f351a12d1622b101bf8114f95aca58f33069733778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 17188 bytes
font_02_sfnt_off00011d3f.bin
5e0486de2eb6d4516c8fb4237450b151e3541419e8579f1b69d2f4175d151aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10744 bytes

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