Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63b87e7eba51ab1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 12:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b607203d701bc4f94004b2b6d18abda SHA-1: b4ea1a9619812c3d8ea93efbf6337d48b2f85290 SHA-256: d63b87e7eba51ab1ebc242ed44a7233385ffc79f0a3c93b7580bbb492b8375a6
126 Risk Score

Malware Insights

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

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 are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics further supports this, pointing to redirection to potentially harmful sites like https://medvor.ru/uplcv?utm_term=cashie+river+treehouses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://medvor.ru/uplcv?utm_term=cashie+river+treehouses PDF link annotation
    • http://geostudio.eu/userfiles/files/napalivumumipemizewarixuz.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/rigawaxuxu.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/nigabisokifupatedukuzirit.pdfIn PDF document text
    • https://teamcode.net/upload/files/takaxixojimel.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///mixamukadazigikiselen.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/93959854791.pdfIn PDF document text
    • http://lse.hu/userfiles/file/95006351830.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/kafibodijekasawofavorekek.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nomexedo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93388637802.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/57189604170.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/xikubimekanadut.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/nesufulaxewarazobemetev.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/posuxesudekaxivurupafafi.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/93584916381.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/gevigukutabudasunujap.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/febadusosenaliledozu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zexojid.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vogud.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/59537985961.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/6977244793.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_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 10252 bytes
SHA-256: 4c06f0dce71709a612b13735e8536e6cda0f6bfd1e6cb8e6fa55d43a4adb8931
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 17908 bytes
SHA-256: cc10552397c242cc9c2aa6139e582cf122d961367fb4f212a690e5cda9de624a
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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