Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eaf3f8eb93e52e…

MALICIOUS

PDF

67.3 KB Created: 2021-10-02 12:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 226bbbe91fa9056d29c1e9899aa71d1b SHA-1: b476f348891645321c5d187c8b6204d03588eee4 SHA-256: 61eaf3f8eb93e52e1dd709345b798c9d50ec4a43a1620e83755cf747390d45a0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as an image-only document with an action trigger, a common technique for phishing lures. It contains numerous external URIs, many hosted on potentially disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.agenbenangbandung.net/file/50074591019.pdf In PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85496522733.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210922171939.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/32943166665.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/31070741912.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/23421720278.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/voxawov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1fe52d6a4---vuloxezapedikej.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8b55004aa14fc278e3d95cb7cce34124/tawizenavibewovotomodop.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/28293967428.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/fujinikadevexaw.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pupibazusigiweluwazodes.pdfIn PDF document text
    • https://best-label.com/upload/files/matibibidumadexesa.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kojejokawemokirulupo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/69579770864.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901115449917286.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/24687676139.pdfIn PDF document text
    • http://automag.pl/userfiles/file/surumomonekomog.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/49577304729.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/75966437175.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/66583112954.pdfIn PDF document text
    • http://budka39.ru/files/98646496708.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/7294990486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fig+and+plumPDF 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_off0000ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 14560 bytes
SHA-256: 2c2fd0dea7a14da70eff800f2700543cf33e515089aa08b7e80d4b61f29a88fa
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10196 bytes
SHA-256: 8b236f691ab387de2d9086f3a6e772efb4aeabb7cd1ceb8d9da795241e1c4a47