Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa4624ab1be8241…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fda94992944c54ccf43d35ff01e1603a SHA-1: 0429a2430f8fcf1cf8d7a384e7808e958282a4f6 SHA-256: 9aa4624ab1be8241ab48d5e1bb71c28ea3f6768bd695f0ae74ca0ee9a9d2eb18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://scalper.ir/data/files/file/pupidebepelujo.pdf In PDF document text
    • http://ltpbetel.ro/userfiles/file/3193106933.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kudumovuditepaso.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/9954264524.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/takolezavutidujupi.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/18359154462.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/pijuzominotuxumaniwo.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/godisosimofapokojajomizab.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/tirumepezuzupuxojefaxem.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632116905768035048.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631509778.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc9b262c9---31201624225.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/fotojafajodanupokegu.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/68334534240.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/61151348070.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/retixiwugufivixurajeleped.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/wodaxipimafupupawat.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/baselapazaluxam.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/panarigelexikujane.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/53755672274.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/xajudawura.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/95074849348.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/somutebazaxusekapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=x+files+fight+the+future+streamPDF 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_off0000bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 10544 bytes
SHA-256: e08060d5332da51970f12787b6e208f715898eb619e1d0c520be816eb6f2dffa
font_02_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 16668 bytes
SHA-256: 3ddc6d52bf6d6dfa775c90158d676e058b4542e963648cdaf5f6ef172c1c912d