Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33fd583d0b3bb6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 21:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cffd8b05f169fbcf02f74415967dc1ec SHA-1: 86353b8e63b78307d81099cd37ed2840aa154333 SHA-256: ad33fd583d0b3bb67d4b89ce0f0ca70bec2150e6dd9b5980ca2b6a47a341787c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=aplicacion+para+hacer+karaoke+android PDF link annotation
    • http://princeverma.in/uploads/files/jovepogolumazela.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/55722878827.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/zemavar.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/potakofena.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/nojuzolo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/76e97666386512913a4f98e95ba82050/74570529887.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/12953862852.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/88150633821.pdfIn PDF document text
    • https://biodez.lt/i/File/nikoraginaxukesefivako.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38271631808.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba98a2597d---81184825542.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907083849670153.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wazuw.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/guvegisupamizabegofas.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/4613817628.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/35938536021.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wonaxazisibujaf.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vozojirolotetafifufus.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/10276875806.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/48432789176.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/96837681694.pdfIn PDF document text
    • 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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 18700 bytes
SHA-256: f4794b99549a429befd9d5185c3372c00fb0a8f60e46aaf800b46ed1160e4b79
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 10416 bytes
SHA-256: d38c3864ae08471f8bf48e734419498d3fa325481b6c6c2a385d87f903faa303

Open this report in the interactive analyzer, or submit your own file for analysis.