Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d9accb5768c422…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 13:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ec20a9a0dc0893272b0fc3e9909ba1f SHA-1: 349f8727aef4b189510fbd77144dd18a3b4c5c40 SHA-256: 98d9accb5768c42251eb7b1b3c788d62f7a3dc56498e101ec5a691be7e03656d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable domains or use UTM parameters, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://queure.ru/uplcv?utm_term=ml+aggarwal+class+6+solutions PDF link annotation
    • http://kopdesign.nl/userfiles/file/98809921963.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156e87fea7d8---24468439479.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/69226830913.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/furesovejolozam.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/34527168227.pdfIn PDF document text
    • https://ebooksweb.net/files/file/21594442931.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/rabazufosikibubevena.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/43408599802.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vipejiw.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/43411362745.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f9568df67f223587b69894efd63c4feb/77852028969.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/tozamoxesabizaki.pdfIn PDF document text
    • http://builderall.info/userfiles/file/fokoripapufipekuvomes.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nogeninewetaloxika.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/11422738878.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/wejejotofirile.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/24120277999.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/wajafizuzorara.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/fifefifopukosezoga.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210926200144.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/bapovekoxuvumuwika.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wunibowufawunibofera.pdfIn PDF document text
    • 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 20252 bytes
SHA-256: fd1de4ac1ca0a1b5a42fd0a4191eb020c9a3220844f029c4a765a1bca0f5d60e
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 10620 bytes
SHA-256: d60f4eabf8548baa7ad59355e57673e8ccefc2ed4b86cb5e70a29f8c5e3d9a47

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