Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3488dc701889b67…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 13:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b4313f9a75a8c8c96021df14041722c5 SHA-1: fccc6b758a55ae05b8bd4bd7cb34327e2f6aead5 SHA-256: c3488dc701889b67d40a9a07dffa1948daa494d8c23a71d4c2007c7a95713cdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct, potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nguoigiupviec99.com/webroot/img/files/26082299521.pdf In PDF document text
    • http://sinching.com/uploadpic/files/202109130627533003.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/leriwuzafovi.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/wataxeromugatebawulelura.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/39937203368.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/donelepaxafamuw.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/ruxizamula.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8d6c5d9a---xaditezibowekonu.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/25080859253.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041624058250.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/69231722023.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/pofupoxizemefupakijuk.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/32484108501.pdfIn PDF document text
    • http://www.bash.cl/media/file/paxiwolugem.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/42269713043.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/toresokijezejuvijasa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/63076393886.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zokaf.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/zanorajudotumasez.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/13075082805.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/50529434119.pdfIn PDF document text
    • http://jcpingie.be/public/files/7748792417.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac2a55bdb---gikelitefirogogatukeluve.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/6478462912.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/72496420415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=da+pdf+a+xlsxPDF 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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 16296 bytes
SHA-256: 175c3e66e201c8f9a30d1b908b9c35fff97483b25db630135ec71b7f5cdc3749
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 9948 bytes
SHA-256: 09cdbd3b74bc05e0977a81120d4c938913bdcbe6588a79aacaa316c64be184ee
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1