Malicious PDF — malware analysis report

Static analysis result for SHA-256 8778f93d0d392406…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 18:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5143673bb2bf900dd6a204e494872af SHA-1: 48a88baf843b4f92c946ccd1ca73043d5eb2c9c9 SHA-256: 8778f93d0d392406c50c12b2d8590de6301e57903ef930778fe1d9eda5694a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://thementalhealthadvocates.org/files/userfiles/file/3925327003.pdf In PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/nedepumagefav.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/newevilotarosizubed.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbb2730fe---wavasuxiladaz.pdfIn PDF document text
    • https://oasis-travel.ro/files/waxosowafatipukumin.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/pifokujuw.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/gufanomefonexepodegu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bemexidosifig.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lifijazetitewadoponiworo.pdfIn PDF document text
    • http://boldogelet.hu/media/43459088484.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/18323875344.pdfIn PDF document text
    • http://jiab.net/userData/board/file/41445080618.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161357ed2ba785---lojananumojemebopana.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/38931849376.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/57010142198.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/64536243193.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/dujutimunulamowedo.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/zogumabepa.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/86391408158.pdfIn PDF document text
    • https://esvigo.com/upload/files/57264735327.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/56406477412.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/92887456945.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/bugixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=prisoners+film+streamingPDF 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_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 10556 bytes
SHA-256: 75452e6f139dd4f09ecfb5ffeb12aee53e3712143383e4de521a802eaccdb48e
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 18696 bytes
SHA-256: 013b012460f7a7f80765f7c1fd0ca2727f89e703ab38b55e8dd2d93ca9a63077