Malicious PDF — malware analysis report

Static analysis result for SHA-256 32efe2c0cc3c5452…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 00:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5feb7b892c31f33533766c2fce99a02 SHA-1: 0057efb3979bc945c97d1e7c91a6305a39ad0062 SHA-256: 32efe2c0cc3c54526bcfdcefff73f8878fb7243ce66e943616e3e439d0ac4c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=get+out+film+torrent PDF link annotation
    • http://mapect.com/upload/fckeditor/file/28041248197.pdfIn PDF document text
    • http://topstec.com/d/files/penigede.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/77154287476.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f3887743---6292148048.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/20317705118.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xototetotaxajezeveram.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136103f8dd27---87959949465.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/20937300730.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/40645430095.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62886271685.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/34721093116.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kuriwe.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/vogosovigepiji.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/matepijijififiniz.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/xalud.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/91740360494.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/34321313432.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/waluxogivabexeratex.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/33989396891.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/fuxaxinufesume.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/pesufewajowotibogex.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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 17428 bytes
SHA-256: e22d83eb45de0929a61781388ae4956c46c59fbc5f7357d074e6bd6fe9c8eec9
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10184 bytes
SHA-256: 6ab3c727e9bc427ab1428c741849faf42c22a5f3501ac44c36f90bcb016f26e6
font_02_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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