Malicious PDF — malware analysis report

Static analysis result for SHA-256 921ac8bca6752cc2…

MALICIOUS

PDF

53.9 KB Created: 2021-09-25 13:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa567c72d056567124be1517eaf5757f SHA-1: 8182ea1e00a647d61845d6e14c25feb3110e4138 SHA-256: 921ac8bca6752cc24dcb85cdce115bb461e73da64feabf40149a14f9a074c58f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8111

Heuristics 5

  • 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
  • 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://ljjxmining.com/uploadfile/file///2021091701023236.pdf In PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gazar.pdfIn PDF document text
    • http://kftchem.com/upload/files/gaxuwimawipunamuropom.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/84765006488.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/5051916894.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/pevatazuri.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/3151407486.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/vigutatesuzarafeguxaz.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zixuvefimulirukeroxujalag.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/16215578873.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a2e21415---japumiruw.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/33226201938.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kasuliloxage.pdfIn PDF document text
    • http://fgosvo.ru/files/files/49863450026.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/96241060379.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/rumikudalijovepafe.pdfIn PDF document text
    • https://netpage.info/userfiles/file/48923845815.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/selinotarovaragevako.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210916092219.pdfIn PDF document text
    • http://orlickachata.cz/files/files/53526882545.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/xepuxeretetivezagemo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/62277394118.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/65818089851.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918022946_83ficn.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bapilusovimexesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=redmi+y3+vs+redmi+9+primePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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