Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe7f54fb974215a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 13:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b43ffaf1568b7f41a0b51ca483eb704f SHA-1: 8f57ed6e5c4152e49cd040f5dee149b773519922 SHA-256: bbe7f54fb974215a177776f27d1e9ce55cc70dcc400e5b6f4279b9476569531c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent to host numerous links on disposable domains. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://olymp-kiev.com/temp/fckeditor/file/90334118509.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/11069565353.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/86908160717.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/mewakuduxipexapijogiz.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65756013505.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210911035215208.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/62443779998.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/xenepukiwokuto.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/50395428299.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/65419423648.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/50685266940.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/21171765443.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bec6070a0---bapalenepifa.pdfIn PDF document text
    • http://technocom.pl/editor/file/30650690324.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/20432276317.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/95428848788.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/jirametakekopad.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/6315839328.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/vosevoluwinogukamufege.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/jigaxenuwimavutelenovujuk.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/pepakil.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/97900146915.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/98682635740.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cc24nse8celm02llm2q8b18jr2/tomodixubolezabawexiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=video+players+for+android+apkPDF 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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10568 bytes
SHA-256: 9578e2b27120b7b9aca5af7cfc211583268875c2550475f8b024ef7e381792b1
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16860 bytes
SHA-256: 1fc88cecba709db0e118d7a510653fcc0d39d0d46b1f5b61c0cc2fc87b1fbafe