Malicious PDF — malware analysis report

Static analysis result for SHA-256 76adfe78ef928368…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 05:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a02c10d97213ba23a472f88e7ca68bc SHA-1: 2f8510205c0243944c0ba0712d407c6f6ca67837 SHA-256: 76adfe78ef9283683bc4623e7f4796dcb83813f381a56efd22b0adb4b67ac40d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the document being used to redirect users to malicious sites. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e447bb86e---89085643373.pdf
    • https://mkontakt.com/dat/file/60110146095.pdf
    • http://dpsszczytno.pl/photo/file/xuxanenosutuwupaw.pdf
    • http://actlogistic.vn/upload/editor/files/jepukuvanosemidajizi.pdf
    • https://airin.lv/images/userfiles/file/43967954365.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/34312525568.pdf
    • http://drairtools.com/ckfinder/userfiles/files/gepob.pdf
    • http://svsteinfurth.de/radsportfiles/file/duliwizijelonuratijilobu.pdf
    • https://raovat72.vn/uploads/news_file/nudorekitakun.pdf
    • https://basisangka.com/contents/files/lubagi.pdf
    • https://liur-krd.ru/userfiles/file/26454083384.pdf
    • http://carrasvilla.es/uploads/files/63257884540.pdf
    • https://rozynoklinika.lt/userfiles/file/751617516.pdf
    • http://banghetretunhien.com/media/ftp/file/74778511444.pdf
    • http://vyveva.eu/UserFiles/File/kideledaladorevuxigeli.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a4b4f6c7eb8802be4c5a6dac7d28853c/poxigelulakuxuwomubabedum.pdf
    • http://cuanhuadanang.vn/uploads/image/files/42642462560.pdf
    • https://glbtrader.com/userfiles/file/kanenukikikozuzisovugone.pdf
    • http://baihsad.com/userfiles/files/20210917_045552.pdf
    • http://abwrichmond.com/uploads/files/3860276874.pdf
    • http://gapoom.com/upload/fckeditor/file/pekofemival.pdf
    • http://thegioidahoacuong.com/uploads/image/files/42381593861.pdf
    • https://nikosdimos.gr/userfiles/file/digifesudez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=invisible+text+generator+copy+and+paste
    • 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_off0000d3a3.bin
ddce3e68582007aed4a35cf0a976669dc780a6b51afa91ee26b1e74ad90cc701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 18612 bytes
font_01_sfnt_off00010478.bin
a6e3958266eff489d3cd540005f905b4cc28dd556749e172d1e4ce63c664cf0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 11064 bytes
font_02_sfnt_off00011e02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes

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