Malicious PDF — malware analysis report

Static analysis result for SHA-256 561f2402b004f70e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 22:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03fe285a2e0241125dd7e269b33cae5a SHA-1: 358daa4868ef71b5ae00256c4bd7be8414db4008 SHA-256: 561f2402b004f70ee73f77cf14a8cbceeef433612c227419e514cdc31002cc93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=getting+over+it+download+for+android PDF link annotation
    • http://wintec-samu.hu/uploads/files/51073538005.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/715003646.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/fagefogaxemezejimo.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/90211768731.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373bdb49310---dixukuwiruxezikosixes.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/68580926900.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/76266713502.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/wolaxuxojusidukuja.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vozisadojiruxizokif.pdfIn PDF document text
    • http://vuason.vn/upload/files/41659034013.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wipibaze.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/31444028150.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/55838437018.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/44282157154.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/fuxukumisezilafako.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/94806792924.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109161027199644.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/fijalixisajokos.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kemakif.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/2501845212.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f57a6f99---vevomebejiradipudutajaf.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xidodimig.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/76734176019.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/48782779293.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/lepolobuxaluritasowos.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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10552 bytes
SHA-256: 23128460fb255c329b34f2488d8452977654aa07a0f416c55336922261038de4
font_01_sfnt_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 14196 bytes
SHA-256: b514f1822ee9c27dc7b4ab08b1a388be004f32682e17c964b15b32913ad56a4c
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1