Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7f7806949681be…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 174aa745eba3829f42278681e86fa402 SHA-1: 8bee8b933a9e9aa3ed2f03bcf4d5743df03be453 SHA-256: ba7f7806949681bed4aca47d936601c5086db26859ec5370c00aeef5e508ba9d
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. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://softtox.com/new/userfiles/file/25614161355.pdf In PDF document text
    • http://hpworld.hu/data/pic/Image/file/rexazezowexalozujupu.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/14178358923.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/ziwogefexufuw.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/74297462112.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4fb1594c---bawow.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/80975452783.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/49645825805.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/72183303973.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/86053928243.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/68727893401.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/pitasobujufewew.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/82287018362.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/94355381394.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021911113488678.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/wavekajig.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/siludulojigefe.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/puguk.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d9abebc7874df8482a58e3523812256/64953510237.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe6328a92---77541462980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=top+10+games+of+2020+androidPDF 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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 10956 bytes
SHA-256: e842b6ed3efb6af9b2b2c62e55b015e7221c381848640c3636db7d3629916f88
font_01_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 17284 bytes
SHA-256: c6c4f9a09f47287948469880352072a42ef7ac5cc4979cdf4c04eed84c1e072d
font_02_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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