Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c00f63efd65947…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 09:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03564677f6036bc7dd161e288b1f3c57 SHA-1: a5f8645cd33afd6842ca5048dddfd4a54021a433 SHA-256: 16c00f63efd659472bd00f305cfadcd252a48fb33e224731fab0c0ad8f736108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of multiple PDF files hosted on distinct domains suggests an attempt to manipulate search engine results or distribute malicious content.

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://ascensionchina.com/userfiles/file/74277399936.pdf
    • http://tecnoservizi.com/userfiles/files/26697557433.pdf
    • http://stellarp.com/userfiles/file/xukamareku.pdf
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/jadek.pdf
    • http://www.kotolantopeni.cz/files/tepirunega.pdf
    • http://hhsmelt.com/upload/files/61304355984.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/50836197554.pdf
    • http://dieta-plus.pl/userfiles/file/lonamatidonutirasowuguveb.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gegemaremafubifefafaloxi.pdf
    • http://hyundaidongdo3s.com/images/files/nuxisamipewekofim.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukt8rmaa9gk0gt0sd8dbelher6/75666419398.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/99274824437.pdf
    • http://adas-muko.pl/photo/file/41481395768.pdf
    • http://skpizzasubs.com/uploads/files/8767897028.pdf
    • http://totoquynhhuong.com/upload/files/jurifewoxenexaxorajij.pdf
    • http://driver-jazda.pl/upload/file/3607681502.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/15073082492.pdf
    • http://kompletucetnictvi.cz/files/file/zatujoxofololobesanu.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8fb551257cb1dec8fc73a56fdac9c59e/71681180695.pdf
    • http://hyundaiokla.com/uploads/files/67987507273.pdf
    • http://chongthamphucthang.com/images/news/files/39580563943.pdf
    • http://dsagco.com/Upload/file/milejini.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tubidy+download+mp4+and+mp3
    • 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_off0000d45f.bin
5714f21affdf557bf3e8a5e43d2937317c411490b9484dbac5eadadcc63181bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 17808 bytes
font_01_sfnt_off000101ff.bin
7af8569963805b8238e1fbd43192ed1c841768ae278670219b73eec46262fc03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 10708 bytes
font_02_sfnt_off00011a5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes

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