Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6eeb9c13cd5c7e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 01:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b43d78cb6b7769fb0aa9476b0c3c3b75 SHA-1: 3b49b7b4d9c973b71572fd8fa1f4b2447e20b9e5 SHA-256: 3b6eeb9c13cd5c7ea4db88b501243b4ca669de5e1ce13a2668b074a2f0a9d742
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://dichvuhappyhouse.com/upload/files/553816617.pdf In PDF document text
    • http://lacasedescaraibes.fr/file/disowikolijikija.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/tekibevopurexofe.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pulevut.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/74607875998.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibat.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/nusanobute.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/towifuxodaxewopixeso.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zizaritejasizi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/kewevilamusi.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/48865737929.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/zafixujegola.pdfIn PDF document text
    • https://coil.hk/upload/files/wokaditutile.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/voropumit.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/zibugaredidav.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613364a68dfec---gagawubupisi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/nufak.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/ranafokajanan.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/53133845371.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/ranewipisadorobejomez.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901140613673557.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210908_103713.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/58475793266.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/78638745255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=train+to+busan+2+full+movie+in+englishPDF 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_off0000bb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB76 17752 bytes
SHA-256: f8db89f31ba65e10c3d5007d15cb3aafa4e67288b27df07e149c3b459cca1bda
font_01_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 11052 bytes
SHA-256: 4c28d1cf8c38c72a123b922f2fb5c82cc398f4b6c2c19a472fdb835c3adc89dc
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1