Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4fdf1ef5e97c9f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 00:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33cfc46bc73e383d412969f640df72de SHA-1: da01ed531209017984e69ca27bfa22f1912d8574 SHA-256: 2a4fdf1ef5e97c9fe05ea6aa52ce09964f6b8c85825310fdce3043572c82038a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://habibitours.org/ckfinder/userfiles/files/tolaz.pdf In PDF document text
    • http://sdds.be/userfiles/file/nizeferomelabiribupus.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vigesamoregirages.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/97088282862.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/79979598130.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/72799246769.pdfIn PDF document text
    • https://razredna-nastava.net/files/96157160348.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jufovupuzawemirufux.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/65945180234.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210902085331896715hfv1ht.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/73602286169.pdfIn PDF document text
    • https://shibbirs.com/media/files/novakidetupisox.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913013414804.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2082_20210912215744.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/44563301128.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142329be15ec---dosugapumogaxaru.pdfIn PDF document text
    • https://beautydent.hu/editor_up/42373480200.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/42980025237.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/kijilasumosonedelufatogav.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1749a3497824cd4de889ebbfd1bca6c9/vawubaxev.pdfIn PDF document text
    • http://esejsc.com/upload/files/busolerumovusufirom.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/pikugoxazizaxufafadibusar.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/xoduzuzibuzezikosodekegag.pdfIn PDF document text
    • http://scantech3d.com/files/15267834059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+open+php+file+in+android+mobilePDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10812 bytes
SHA-256: 1c979a83253ae1045bad0a2cf8e58eea3638a00af53d850677acbeb444c06d25
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 17672 bytes
SHA-256: e130e8717b6efa9fd81abcb50437e519bae1de0658ff8d2006fd0e44c061e4d2
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1