Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e4d77d752d6abe…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 09:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 742d7240599894d242672488883b9bd1 SHA-1: 51b8328b5ab9ac71f51a24d5ade869afdba7fcad SHA-256: 95e4d77d752d6abea7de899286680d491ec95be75a7faf05fc87b4cd23dabafe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://tsutae-f.com/js/upload/files/jesus.pdf
    • http://binhchuachay.info/Images_upload/files/furerigenazagugumizel.pdf
    • http://nguyenxuanhuong.com/upload/files/56746289085.pdf
    • http://kartelabasligi.com/images_upload/files/67205547701.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sikorul.pdf
    • https://reparation-mobile.net/userfiles/file/pipigesesimakijojoxolu.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ruvifoge.pdf
    • https://doluhosting.com/calisma2/files/uploads/botefaleteludi.pdf
    • http://chi-kara.net/userfiles/file/68884533110.pdf
    • https://polytex.de/sites/default/files/88478271165.pdf
    • http://volker-issmer.de/userfiles/file/91770012190.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/pivepesiguvek.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/murokewob.pdf
    • https://bongkartuantakur.com/contents/files/napanalux.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nufabafemidoxazozedegofol.pdf
    • http://dentalclinicbangalore.com/uploads/70330102974.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/79693864849.pdf
    • http://mrpokedb.com/uploads/files/gotijadixepipux.pdf
    • http://websteravelandscaping.com/editorData/file/23246533162.pdf
    • http://jeyadhurgatemple.com/userfiles/file/75017480790.pdf
    • http://aspbae.org/userfiles/file/98314086280.pdf
    • https://ienter.bg/files/kimejekisaxaredazadamuwin.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/4115446012.pdf
    • http://abbeytraining.net/userfiles/file/69805448739.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5384f300ed46efab98d1129a5e83244d/19414697814.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+crystal+cheats+rare+candy+and+master+ball
    • 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_off0000b3a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 16792 bytes
font_01_sfnt_off0000cbb9.bin
6d03ca4edaeee5a3a5e07d24f5543846e9a9d9dd1948be644314cc6b2e107058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 10892 bytes
font_02_sfnt_off0000e4c9.bin
3c0c71c7be777d943f5914df90aa37c04cf65dfb35455e988bb4193ea2603be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 15168 bytes

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