Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fbbdfae7e764c9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 06:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8571badafaa3d57c942c27c32b11bd78 SHA-1: 3bd67d5195aa28f3964798110e6428a8a5c814da SHA-256: b2fbbdfae7e764c9cc3dde09dd63584cd83d678c489beff032f62e04da5e6b00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document is designed to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://noclegsosnowiec.pl/eurostyl/photos/file/44249398473.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/lorepusol.pdfIn PDF document text
    • http://underbutter.cz/download/foto/xodutosodisigobexajiman.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/valel.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/mazerideselakarozuwupe.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/40928470913.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/jawomo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xamosawiladotuvuxijige.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/fivagivuwo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vg0h1r72c23k9qc12lf50lsq25/92580828431.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/nunirekodakudabejuwod.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/60261976784.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/fowakatuzifok.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/venuvazobilamubazuzuvupu.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zivagozepedumim.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/niwukojaxol.pdfIn PDF document text
    • https://airxps.com/userfiles/files/5971590762.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/jiwinawiwudavixum.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/42902987729.pdfIn PDF document text
    • http://preiss.at/upload_files/files/lerufaz.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/desidunokujiwamatep.pdfIn PDF document text
    • http://tcihk.com/userfiles/34982128695.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/98303313273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=now+and+later+full+movie+watch+online+123moviesPDF 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 11312 bytes
SHA-256: 8459311f2bf5aeb025db1c07768b8c6aff811a09c2b8e335387be92ce5b66728
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 18496 bytes
SHA-256: cbcd081808d6705a0bc51f41a304f03a3d518f998af48a0b6621c5725b247a5b