Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c1ca1bbb6a9d6c…

MALICIOUS

PDF

65.1 KB Created: 2021-10-01 02:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 525691b569d89065cdc8372f58e535b2 SHA-1: 84612f99aea7abcee599c6320f6305dfc6111b31 SHA-256: 28c1ca1bbb6a9d6c7646dd7a8d39e80c56736b8163a0cb5ce26a19d0a4bd3f70
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7120

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://american-security-inc.com/assets/ckfinder/userfiles/files/16872977991.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161356daa59961---53666034675.pdfIn PDF document text
    • https://biodez.lt/i/File/87026578920.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/jofadugevorebukogazuj.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/lilovuxefotokodufiwo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/43504537949.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/fajodabumepi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/37092407366.pdfIn PDF document text
    • http://khocabien.com/uploads/files/79557504794.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62006093994.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/12553344556.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/803603395.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sexakujekuroxeru.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/55880150320.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/23353792974.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/tixigujara.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/79553110910.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/83381138056.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/90743610439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=connect+macbook+to+android+tvPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 10648 bytes
SHA-256: c5ff083e59959e992308260bf22fb66d3ab9f3ea6134b8c838acc4c44cf3cb2f
font_02_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 15988 bytes
SHA-256: 8aaaaf8a80c638d1fa9f119dd8570ba8b37762c71d07324b27a753396bf31757

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