Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f7bccb17d84fea…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 13:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11216e9b0dd924821d596de3fa19e611 SHA-1: cf2f1601762eb73edf8d707d42dabc8bdbbceba9 SHA-256: 53f7bccb17d84fea091384edcd7ddc9ce1222983a67252b562d29e69035f9c74
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including an image-only design and embedded links, as indicated by the PDF_IMAGE_LURE heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs, some pointing to potentially malicious domains, supports the attack pattern. The document's structure and heuristics suggest it is intended to trick users into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://thuexe7cho.vn/upload/files/ferorujaxejidowebexa.pdf In PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/93418570639.pdfIn PDF document text
    • http://novichiha.ru/pic/file/47221309004.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/mijigebalurelal.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/tumamijipefagodulipuk.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bifowurole.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631972207364675565.pdfIn PDF document text
    • https://jck.ro/userfiles/file/tajusomaviwomorokimulag.pdfIn PDF document text
    • https://kapefashion.com/files/files/kasesugulinaseko.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/49008105724.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/zavujuxune.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5242f645e7b5714d48cce0fb8eacef45/47123632313.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/61505314214.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gobapof.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/80738339623.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/daxuvumebane.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/fugivemapawir.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/radunovebepulamizo.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/27276328027.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136007168ff0---54906624890.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/18368835819.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/86425830321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+download+android+pcPDF 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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 14048 bytes
SHA-256: 50d221d808b5b73712d4cc8924c630f74a2d44eef662c2e506a44369257c7d86
font_01_sfnt_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 10464 bytes
SHA-256: ded091cc7bf4eaad669311c550b8fc7504bbe09a1b4c806a7d5dd808d45714e9