Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee14b48d0286d2e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 18:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac5d92c1675927fb081a0e6a5aa7137 SHA-1: efbad67bd6ed7f16b6fcd47b660ca743f77b2164 SHA-256: fee14b48d0286d2eefaa9420252491ffa0d6ff286002c2c1699c54003f20a4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful content. The authoring application 'wkhtmltopdf' and the presence of embedded URLs suggest a mechanism for delivering malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=download+sonic+runners
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141bffb2b5a2---ferujunanugulijajurur.pdf
    • https://kientrucqhouse.com/uploads/image/files/bavesetetiliwizaratizup.pdf
    • http://hai-bi.com/uploads/files/202109070644056919.pdf
    • https://www.parcdelorval.com/ckfinder/userfiles/files/rogesiwobamekufemaxawuwo.pdf
    • https://dusunceokulu.net/resimler/files/80285954975.pdf
    • http://vdadanang.vn/app/webroot/assets/files/40213549047.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135756b2e9bc---nazasinafo.pdf
    • http://linkingpeople.info/userfiles/file/84955743209.pdf
    • http://lpxs168.com/filespath/files/20210918185823.pdf
    • https://residenciasanamaro.es/userfiles/files/rakidugukapufetozuk.pdf
    • https://maydangson.com/vietkiendo/upload/file/bowotelixudine.pdf
    • http://dulichtantai.com/files/uploaded/files/karulezezas.pdf
    • http://leylasuren.com/images/userfiles/imagefile/24183837977.pdf
    • http://biancoacolori.it/userfiles/files/29175738516.pdf
    • http://www.valaisconsulting.ch/file/joxemitev.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/80243649287.pdf
    • http://ubestsports.com/imager/files/20210908085501.pdf
    • http://greenglobepms.com/uploads/wurupedaxawulebe.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/nogapupudepixewakere.pdf
    • https://truonggiangcompany.com/userfiles/file/supig.pdf
    • https://wonwon.taipei/photo/file/kixegaponiwodoxul.pdf
    • http://exhibitionchannel.com/upload/jekivokovida.pdf
    • http://biolabsrl.org/userfiles/files/92638651292.pdf
    • 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_off0000d19f.bin
336a977c723482cae10adb76ef84cd67b1331740dd9e785e483ea74aefa33989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 10452 bytes
font_01_sfnt_off0000e980.bin
1e8b3c8cacd128e2ff560282c9dd22ed1cd8555df2699546722efc9d2d55076a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 19052 bytes
font_02_sfnt_off00011bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes

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