Malicious PDF — malware analysis report

Static analysis result for SHA-256 a535bf78c4a6d66b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 22:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d9767150ec40076588c4a1adf264da0 SHA-1: 34fc1faec93fd4d90a4f6276a26eb1a1c2c47bc4 SHA-256: a535bf78c4a6d66bde9d9b13ceca03c7934846f31694d71ed3913f2316eb893b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=real+cricket+tm+go
    • http://iviltra.lt/images/files/wofijurudaloz.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/zodopinapufeximolutodi.pdf
    • http://www.keizerco.nl/userFiles/file/xiropetemojek.pdf
    • http://criminisiepartners.it/userfiles/files/xusepexunalosamudater.pdf
    • https://bruceleevideos.org/images/file/fipagexulularogogimifisox.pdf
    • http://mt-filtration.com/uploaded/file/77218785261387e0a8bbad.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe934323ab0e27fe1e3f72b730c67ebf/24914073495.pdf
    • https://commonlawhouse.in/userfiles/file/677600641.pdf
    • http://dent-pro.cz/pic/file/22952635378.pdf
    • http://totoquynhhuong.com/upload/files/18331809589.pdf
    • https://pristineleather.com/userfiles/file/vubiwokoxifizi.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/14238116719.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/daviwapilupomila.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nopesabap.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/42793547593.pdf
    • http://banner-ever.com/ckImg/files/75635353004.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210909_D659760585FB7B66.pdf
    • http://mrybalko.ru/files/xamalo.pdf
    • http://studiodugnani.it/userfiles/files/wulubonot.pdf
    • http://www.wiz-fac.com/uploadImg/file/19586452807.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/dukixubazamurokobu.pdf
    • https://u15.ch/ckfinder/userfiles/files/golijugobusopafeba.pdf
    • http://eventologia.com/userfiles/files/mutezuvupob.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_off0000cbc5.bin
dc373d2ef01cf386dc57f676f524d8a382a33b22839f09eae6d430a6ca0c7762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 10440 bytes
font_01_sfnt_off0000e37b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
font_02_sfnt_off0000fb8d.bin
02408e7c89734caeb072e5e4d6bed4d876c00dc138cf55b8baa2ccdeacf4c0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 17176 bytes

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