Malicious PDF — malware analysis report

Static analysis result for SHA-256 0221b344085a718d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 00:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf4eb006e4d7584f955504613611617e SHA-1: 6140e23bae9d1365c6ec3ec969a1c4a5ac302de4 SHA-256: 0221b344085a718d66e4c9a25a8b59efa94cfdc52619a2fae732853b04e8e5d1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of JavaScript suggests it may be used to obfuscate the links or perform additional malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01a279e80---vazifefaxutomajut.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/87971870312.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/83908890029.pdfIn PDF document text
    • http://livilgirls.com/files/gizaj.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/datokademanon.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/ridajuginasu.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/18165079210.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/22966978465.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83db46b80d052719342b240564d0f1c7/64781385191.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/nunokutizuwinebemizup.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/gumuwekun.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/38309712231.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/bujekapujiw.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/72659188112.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/ginexelulogibavefunu.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdfIn macro / runtime command snippet
    • https://specializedfacilitymgt.com/public_html/userfiles/file/67562497473.pdfIn PDF document text
    • http://jfe.hk/userfiles/dobaranewak.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/dunafebupuzomizufode.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/nedulifuwaz.pdfIn PDF document text
    • http://landia-print.com/pdir/file/15517958962.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/58271065293.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jojimedurekulukev.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/98231726011.pdfIn PDF document text
    • http://aaaexpressac.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+downfall+full+movie+online+freePDF link annotation
    • 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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10816 bytes
SHA-256: aae752cc2c2ae4405dbdef344ee14da9975e005dc8b187e0e9254468c94b4665
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 17596 bytes
SHA-256: 0754e5c5b518c9f76d4666a454fb5247e6d243926371d23faa04aec28b2c8e5f
font_02_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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