Malicious PDF — malware analysis report

Static analysis result for SHA-256 653300df92b9f736…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 09:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57b7a1bc18a1e91846351865445155f2 SHA-1: 1219e15e3e60b07175a2ec3a43dd5cecc68ed6b0 SHA-256: 653300df92b9f7369edb2e32e3de7fd904bef20a91085284956c887bdb0b7437
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drakbera.com/ckeditor/ckfinder/userfiles/files/vununujepavuxa.pdf
    • http://csc020.com/userfiles/file/20210901074919_d4nw0m.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/33493861028.pdf
    • https://trvstore.com/userfiles/file/dafamuwukaxoj.pdf
    • https://jck.ro/userfiles/file/feruliji.pdf
    • http://alatasfilms.gr/ILC/img/file/rinavizojabumifif.pdf
    • http://tgroupsrl.com/userfiles/files/23252658683.pdf
    • https://jkmart.net/FCKFiles/File/9621050928.pdf
    • https://myparrotfood.com/user_files/files/suruwinux.pdf
    • http://dvif.fr/userfiles/file/74156378718.pdf
    • http://mcserpenti.com/userfiles/file/kofilibadotixalok.pdf
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/vadetabuvex.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3c439d92dafe459adac28555f0df5d5b/71458350205.pdf
    • https://ostrichtours.com/ckfinder/userfiles/files/xomiginisirilazag.pdf
    • https://securitydm.net/slicice/file/nexusexomelosuvisinipa.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/nodaralijulifil.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nupagofesowi.pdf
    • http://sztarmedia.hu/_user/file/puzomama.pdf
    • https://vegan-eshop.cz/data/file/sonatokaseporozo.pdf
    • http://blueleaves.ru/userfiles/file/538597586.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+a+brewing+stand+in+minecraft
    • 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_off0000e6eb.bin
1e85fe1193d328b3cee6a5618ad223b2196571df5d9b9bff269e614e6d64575b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 18404 bytes
font_01_sfnt_off000116f3.bin
72186bffc3bc2f78e34bd15030c93247582b8b96363af50ed18e88b0dd6c7c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 10976 bytes
font_02_sfnt_off0001301e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 16792 bytes

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