Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227bb09a8e95ca5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 08:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38291a0a2c6b81589d408ca3ea29a45e SHA-1: e5a0328772eb7235c307bb1e7d485b4256457c15 SHA-256: 2227bb09a8e95ca5f2891a75f962b1f49605102e375d301ba25ae8b8bece3b3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded content suggest it is designed to redirect users to potentially harmful external sites.

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://honderhotel.com/UploadFiles/FCKeditor/20210911030155.pdf
    • http://kystar.net/filespath/files/20210909102818.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/48262058359.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/tesolefabexipegisepit.pdf
    • http://hzqljsj.com/images/upload/File/28399548380.pdf
    • http://highendschmiede.de/highendfiles/file/zovawanesuzolavomemi.pdf
    • https://aporpeter.ro/userfiles/file/poligizutovukez.pdf
    • http://taxfreepoint.com/file/fumarakabej.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nafaxokuso.pdf
    • http://mateuszkucharski.pl/admin/file/26948590942.pdf
    • http://bimbrlata.cz/UserFiles/File/mojetirusux.pdf
    • https://greenways.at/userfiles/file/52504537311.pdf
    • https://vanphongphamhienluong.com/upload/files/xofodaworij.pdf
    • https://grandhotelushba.com/userfiles/file/70576298071.pdf
    • http://koala-al.com/d/files/fitadejafifosukitosol.pdf
    • http://hytechplus.com/userfiles/file/27852898328.pdf
    • http://thevisionkharj.com/userfiles/files/rulenifeluwo.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/52448128341.pdf
    • http://gernano.eu/gfx/userfiles/files/3375334071.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/42419311202.pdf
    • http://koala-al.com/d/files/58267207630.pdf
    • http://divorcefinance.nl/uploads/file/35032692542.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=everything+android+app
    • 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_off0000e2d4.bin
46e3694b459266f586333805d5f6dea1ed7b5864662522bbd95deb9b73244523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10620 bytes
font_01_sfnt_off0000fad8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
font_02_sfnt_off000112ea.bin
4cafc490be09176139c72a5825a5a78d173c4692790dce0c16c8f6f1ec7d5cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 17672 bytes

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