Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed23564cbf488f6…

MALICIOUS

PDF

68.7 KB Created: 2021-09-14 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42428029d159c59e2e0427ad14ffad5a SHA-1: bb4cc0c465fb8a465c4fa0c35f534a43b28c9567 SHA-256: 5ed23564cbf488f68d785f4bb8b321f3f3f55149c9f6736fc9d983b42d3c976d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded content suggest it is designed to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://exito-opakowania.pl/userfiles/file/54060202166.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138c22d8a259---bifawovadijugenuso.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/56629713067.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/bewisofikewobil.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312322629202.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/dodexefezava.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/rujasenozaxudakikofix.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/fixila.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/89745472743.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nizefisof.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/46689153631.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021971049316964.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/235258291.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/60761657691.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/44039873914.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fegrmmbqq1snl3if6ivu77na33/77626323581.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/18541335160.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nikinavafoduveje.pdfIn PDF document text
    • https://oferta.lt/i/File/gadaxusipirasopubel.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/28829383420.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/futarixewiwafulomijuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+way+to+transfer+data+to+new+phonePDF 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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 14920 bytes
SHA-256: 6b8af2be5bad631f1253d5303e77ea56048d85b16b3ad011dd3315cbf5f17ccf
font_02_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 10712 bytes
SHA-256: 05d87cdc6cab7c21bc9c1daf69154bec50278b7f4a34209ef249a32c86734523

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