Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2328819dbf2a3ac…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 07:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e05c532963e76b46c2ceaf0d2a2c1f3 SHA-1: d2e3a2b2bba34c70f0d56a3185aa9e0684377919 SHA-256: d2328819dbf2a3ac502b90f31feba244079284634cf5f5839ee53b57fc07a6a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://darec.sk/files/files/leviberiji.pdf In PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904021951166797.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906200915.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/69958918922.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/30998382966.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/xeworo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/68205063788.pdfIn PDF document text
    • https://loyd.rs/images/file/46059977913.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/laxunefozekaxonalilaz.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/2169010594.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb20eac6b---22247847458.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/repajapaxixafesilan.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/6680885608.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/badeludezetedur.pdfIn PDF document text
    • http://kelsenator.com/userimages/pepiwoxa.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/6666732431.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/89961424178.pdfIn PDF document text
    • https://btegypt.com/file/fiteto.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/97483621210.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/pitekuxobasutusekin.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/65908591254.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/67660947875.pdfIn PDF document text
    • http://cjatkinson.com/userimages/36386122223.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/berajesefusekepobiliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=upstream+b1+student%27s+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 18916 bytes
SHA-256: 720ef091f304b184e8c56c5b15646a20ccf6d4b51e7939e04f3463caa1308fef
font_01_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 10944 bytes
SHA-256: 51216fbf5b0b9f4eeb9e37a9a89becac02996a2a342d223f53fb24ddead1e29a