Malicious PDF — malware analysis report

Static analysis result for SHA-256 9512d4d2883ffad2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-24 11:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb303ccaa8b707d18ed59b0609d87731 SHA-1: 92ebdc5a66a66df517508d0f7d31d4eb50197704 SHA-256: 9512d4d2883ffad26ccd1084db7e8e0f3fa7f5b09ff034d204d3a4567a906615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=3rd+row+periodic+table PDF link annotation
    • http://bmfjhjk.friend-match.com/upload/files/68539819740.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/loxikozevovajijewafujeze.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/90093709389.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/5176190743.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/buzoxopopikilirewofela.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147154119fee---suwekutetemavowesefusija.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wifekuse.pdfIn PDF document text
    • http://clerus.hu/files/file/28459662187.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/38097849981.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77520242749.pdfIn PDF document text
    • http://fitviewer.com/files/file/99534273151.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/85410560061.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/gawamobezu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/67477927647.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/60958973732.pdfIn PDF document text
    • http://nova-auto.com/upload/74352166455.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/bajamubal.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/87295541028.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583b3247f7---dufota.pdfIn PDF document text
    • http://ccsl.asia/files/72078000972.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/kaxefizisolujixigi.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/bevidewoxukiwida.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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 10536 bytes
SHA-256: 786b3e1f4f10e6ba4614c8866167d3d473ff353964758058feca78da3ecfb13e
font_02_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 17492 bytes
SHA-256: c54ebd36a170935a2a0837df0ef6eccea0af492649b0a9ba76ac1102107c926e