Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38ed9c971e609df…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0b3170c9517a5803fcbadfd672474d7 SHA-1: 72a3675d8eb54b53bb24285ab2364f65baebbfa5 SHA-256: e38ed9c971e609dfec6e911c2072ebdf4b2ad7b16780014225ab58566f73779d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable hosting and forming a link farm, which is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URI patterns suggest it's designed to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tlkingatlan.hu/kepek/other/file/xovorobapokavipes.pdf In PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/86775258565.pdfPDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6211ca01---ferugosuba.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/2465867383.pdfIn PDF document text
    • https://dhesient.com/media/74730678575.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382616e83f0---95771812167.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/mivovutede.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210910_021402.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wavirejivokoxe.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/bovixadanugakukukoju.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61424fdbaee6a.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/dokunufuwofusozi.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/14471787696.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210910_B7CAF8DE25B95513.pdfIn PDF document text
    • http://onelove.cz/file/46127772156.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/73545727307.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/vobizekekefeguruwugedip.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xeredarurujobe.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/67586924240.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/boviridefufazetarudevug.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/liveba.pdfIn PDF document text
    • http://15881588.com/ckupload/files/16068202017.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8a42398---88929028240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+data+from+the+phone+to+sd+cardPDF 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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 17456 bytes
SHA-256: 7b49a13ddba0103d774271153f70d693aa4085cbaf838b0a2dda410836b875ba
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 10824 bytes
SHA-256: 044464aa32630b8a85bb0ac2dd49078af21560edfbdf61abb332197b2ee75a36
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1