Malicious PDF — malware analysis report

Static analysis result for SHA-256 997f30851f4b3b60…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 03:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b50aaff860d673a76050adae6b8b3ca5 SHA-1: 57c8818601daa41f4081a901ad40d5ff03205d01 SHA-256: 997f30851f4b3b60887cab6df9c9f5af09e71c2d293ba9a435e4a4cc47076325
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 0.9966

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.
  • 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://clinicaveterinariabilancino.it/userfiles/files/jepok.pdf In PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/58103952077.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/kujuvapuman.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/sekomavoxinipo.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/797522634.pdfIn PDF document text
    • http://agavietnam.com/img/files/87963139437.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/60213484665.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/sekerumub.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/66313743738.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/16102667434.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614823cb55220---jiridalulosavadeduwu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/12927959600.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/77453269331.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/35957114341.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/86897802324.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902040056.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/mimoxejemiguzowafewasav.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/newawuturigumoluku.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/91765906793.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vikipuzoloxizabexasefo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee36dc400f---foxizipawawug.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/ralirafuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chal+mera+putt+2+download+torrentPDF 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_off0000ad16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD16 10732 bytes
SHA-256: 6ef739319b28d2ab11df9e5129c92e19c2a9ab9f24b029ea45dfa5080c1dee00
font_01_sfnt_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 14756 bytes
SHA-256: 62c50f4c4f89112e05f1e2676c38ad0c0a13b004441ed5da734faf2659f08e71
font_02_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1