Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa46457ccf873f7a…

MALICIOUS

PDF

92.4 KB Created: 2021-09-10 06:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5d888dd37ad9b8166e7ec05296ff265 SHA-1: c1540076c82c66119a70a74f291fbb7b9c5a4554 SHA-256: fa46457ccf873f7a5918924b00f0500555fa845ebb1c0ec7f7826b879fb2f14a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malicious content or engage in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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 https://hebatkeren88.com/contents/files/96218558890.pdf In PDF document text
    • http://coytex.net/ckfinder/userfiles/files/3743153597.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/tamemu.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/12563423740.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zebib.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/zumuruzezabalo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908232301.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vosarisonokugopajojud.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/37586084511.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/4094675148.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fcl99nge0dvb7j6riogru6mtsd/86529696844.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/56225222796.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/jatejanazuruvoja.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/gofifexaxobaporo.pdfIn PDF document text
    • https://pecsikult.hu/files/file/82460227286.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613751a462afa---6542439044.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/21050065543.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/28687182845.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/merat.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/14330959701.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/dujafub.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/sonapoteduvo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdfIn PDF document text
    • https://avela.md/userfiles/file/tebewarusedipekuvamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gameguardian+no+root+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 23572 bytes
SHA-256: 74913442a068455c6ca3b299dd68107f59894ed8e79751da590b9c4301c13a4a
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 10752 bytes
SHA-256: e3532237c3da763fcf2413a12ab98df0ab1f148b17044642863a59bae27f2128
font_03_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_04_sfnt_off00014a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1