Malicious PDF — malware analysis report

Static analysis result for SHA-256 882110e15a6f1da4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 11:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d5bf667e5fd9d8ab70978f272d56f75 SHA-1: fd84eaefbc298948270a7762c1a6669e56b22e55 SHA-256: 882110e15a6f1da433121d9d56cbb1308fd4e8bfc5bd9ff561144d083e2afcc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://spec-so.ru/sites/default/files/file/vupufakuzuvufakukizeno.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/58411379746.pdf
    • http://jandebruijn.com/uploadimages/files/soxolorisil.pdf
    • https://euroroma-bg.org/files/file/13520352276.pdf
    • http://studiozoppini.com/userfiles/files/powipebesoneduzitobu.pdf
    • https://pmapmc.com/userfiles/image/files/86942558777.pdf
    • http://saraya-shop.ru/upload/files/91243321350.pdf
    • https://bokaichenyu.com/upload/files/jewave.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/zipatofi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bb632a82---80867669149.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/36436096395.pdf
    • http://kunbot.com/upload/files/bumivekuzumes.pdf
    • https://aynispirit.nl/userfiles/file/difapotut.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/59030294345.pdf
    • https://airin.lv/images/userfiles/file/kozapikinivazopakibelefi.pdf
    • http://theclubburger.com/uploads/files/wugakomaketuwagema.pdf
    • http://balade-pierry.fr/userfiles/file/54980878005.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/23358390555.pdf
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/013c3944b4e6016631dc134a3d265a9d/8224972065.pdf
    • http://georgewongdesign.com/gwd/upload/files/lawabizowirono.pdf
    • https://aedwea.com/upload/foto/85339661897.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=not+able+to+see+call+notification+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb4.bin
050e11069a5e2db1756d71dae03cac1cf6fdc07eb7b0652378527ba528322652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10588 bytes
font_01_sfnt_off0000f3ff.bin
52aac02e43cea5194a938979ee00b2bbab61d3390b1cf049905d3f65a8002ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 18224 bytes
font_02_sfnt_off000122ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes

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