Malicious PDF — malware analysis report

Static analysis result for SHA-256 82adebbcb1849638…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 05:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa401ba9c29a9df1589a402d4c92c046 SHA-1: 8e8a83e14ce104ba1289aa57fda49d63fb16ad06 SHA-256: 82adebbcb1849638d97da325ed75511b21c69baf059818bfebae34e4dbe7e3eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://allytemp.ru/uplcv?utm_term=note+9s+dimensions
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95599393356.pdf
    • http://adice-area.com/pictures/files/zewizuwodijaxib.pdf
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/23359453969.pdf
    • http://moonlightmontessori.com/upload/files/81962799632.pdf
    • https://balajihighfields.in/userfiles/file/xabet.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vetadebiwerurutoxoki.pdf
    • https://lotusmarinevn.com/upload/files/73304672433.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/4758364776.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/dofipuromebemujegimenoza.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0eebd5b2---46294136755.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1631330195.pdf
    • http://libertyquad72.fr/userfiles/file/33603106078.pdf
    • http://cerrutistudio.eu/userfiles/files/9177959506.pdf
    • https://www.karelo.com/uploads/File/2394538309.pdf
    • http://designerhouse.ru/upload/files/vonevudadoki.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37877788961.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412adf8f62f---36391967129.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/55718901336.pdf
    • https://ce-mi.pl/uploads/userfiles/files/68011042702.pdf
    • http://mbfeed.vn/upload/files/saxorufo.pdf
    • https://thuaphatlaihanoi.net/uploads/files/24160811689.pdf
    • http://phubozena.pl/userfiles/file/88686221614.pdf
    • http://jhdljz.com/userfiles/file/1632476978.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/watikaverawarovukos.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23448014842.pdf
    • https://computerzone.pk/file/37003706505.pdf
    • 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_off0000b4d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D6 16792 bytes
font_01_sfnt_off0000cce8.bin
8cd22e684cfea3aef27b6a132b8519a54520df6dba2d508bdf1dd80c3744ec71
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16004 bytes
font_02_sfnt_off0000f621.bin
6b7bece77dbca0ef5be768a19f4231f969a8a1544b3e74f913de844dedb8c390
pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 10248 bytes