Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8787ceeae040e5…

MALICIOUS

PDF

86.6 KB Created: 2021-10-11 00:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54c5af61a3d4cf8eca48a430f75c4b32 SHA-1: 0ad5386117e326dfad26fa01845977c551445b8b SHA-256: ee8787ceeae040e5add2868d8f746e9e0fd4f52863eb1ff17fe304a0925212c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code, likely to redirect the user or download additional payloads. The numerous external links, many pointing to disposable domains, reinforce the phishing or credential harvesting nature of this document, aligning with a Spearphishing Attachment (T1566.001) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://casabresciani.it/uploads/file/3216320832.pdf
    • http://bscartridge.com/pic/xopobaninusegopazagukobeg.pdf
    • http://magiepourenfants.com/images/mediamanager/file/99243574436.pdf
    • http://nuovojob.com/userfiles/files/4354976515.pdf
    • http://agilesolutions.in/uploads/gimarekig.pdf
    • http://z-sinpro.com/upload/files/85997409832.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/13428587521.pdf
    • http://ottomaniantextile.com/userfiles/file/29691995332.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210923_B5B16E81D6F27687.pdf
    • http://profiklub.sanswiss.cz/files/file/dufonoro.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/mutegazos.pdf
    • https://vanchuyen.pvl-soft.com/site/files/batigumeb.pdf
    • https://alhurwallpaper.com/Files/files/25334367157.pdf
    • https://mai-avto.ru/upload_files/file/80103749007.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76027802873.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb200141b9787cf397105fa2d9776803/92395691706.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/reguvuriteb.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/xibarusawomusabuvefi.pdf
    • http://dep14kirov.ru/userfiles/file/kazude.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/zeditotoromotesolixu.pdf
    • http://scandirent-new.ru/uploads/assets/file/79973739618.pdf
    • https://www.naabelectric.com/userfiles/files/tatozuvuxigobukixegelov.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/nizavuw.pdf
    • http://bidwoodmachine.com/d/files/30912578240.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+most+expensive+property
    • 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_off0000e7f7.bin
6b169e6741a3fad92801dee3ab5648dc1a901fa121810e1e138fc78b4393ac60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10820 bytes
font_01_sfnt_off0001010c.bin
64f0cb9cd90e03b804f8c3f12ad315dabbabef2a8de0b11703e0d4184f72f4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 20024 bytes
font_02_sfnt_off000134ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 16792 bytes

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