Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f9c72364f9510…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 17:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8070de1e01ef259c4e22876b7fde2340 SHA-1: ccbfec63845a4e66c4952d4c28332c9113de0922 SHA-256: 1c3f9c72364f95106281951fc76e0e95216f693aad4002da5ef947d49a107193
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it's part of a link farm, and numerous unknown URLs pointing to PDF files were extracted, suggesting a distribution or SEO manipulation scheme. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ttccid.com/userfiles/files/zujufalo.pdf
    • http://forumts.com/ckfinder/userfiles/files/sigurugiwogubebasasawutew.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/85523748554.pdf
    • http://inciboya.com/resimler/site/files/83640027102.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/bibitukexusolevopur.pdf
    • https://nibrasimansch.com/userfiles/files/44665592033.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/jivawilebifulu.pdf
    • http://www.chubsorn.com/file/files/kogora.pdf
    • http://utcsp.rustyramone.com/uploads/files/mozogekugof.pdf
    • http://csc010.com/userfiles/file/20210901082427_y1rhik.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bc50771868a8dabef5994f37577dbb3f/maratetilejesuvep.pdf
    • http://sun-apartments.pl/data/pages/wunabukosaketozelejo.pdf
    • http://chuanghuilaw.com/filespath/files/20210903181749.pdf
    • https://ijtm.in/userfiles/file/vofepimem.pdf
    • https://viadagio.be/userfiles/file/57738180472.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/87747761573.pdf
    • https://albizy.com/ckfinder/userfiles/files/40675838119.pdf
    • http://mackyz7automotive.com/js/upload/files/62789700574.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/waxetoxixawejo.pdf
    • http://domexpo.ru/up/file/gibuxunu.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912175627295219.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/lipiriburusegatedaluxog.pdf
    • http://begues.mobi/userfiles/file/18815811038.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161367e810d4df---77250684528.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=minspy+mod+apk
    • 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_off0000ce1a.bin
b38db65fb2062c9de69bc75f6e05a1fbcc817e6370cdb842cab5d32198173442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 17160 bytes
font_01_sfnt_off0000fa91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 16792 bytes
font_02_sfnt_off000112a8.bin
4211443df6bd62f38d1499910f598fe55a791dd95400d13890adcf5cb16da0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 10376 bytes

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