Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05c01f1052b27ab…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 08:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30a5401ba339276cd02e15459c3f3a81 SHA-1: 7c481ca32a1ea8141e67e8f0a76c477e9eb479c0 SHA-256: b05c01f1052b27ab8b232fb44211aa43e91fe6e7a623f6c6381a6e0b19502f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to obfuscate malicious links and potentially deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=hdmp4mania+latest+movies PDF link annotation
    • http://ronaldtan.nl/images/photo/gexod.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172c2f35f4---25474213511.pdfIn PDF document text
    • https://cakkue.com/contents/files/tigivorimo.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/bidadunozomaguzisi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/563kjdi2f6udpbm4548go4qgp4/durewofagarejojiko.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/20098274242.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/8672257292.pdfIn PDF document text
    • https://serka.com/serka/upload/files/52216043940.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/99595690958.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/98221316587.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/66371212275.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/8345253799.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/pujiriwipoxob.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/15215616900.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210917051712_v9nzdn.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/59114105282.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/dexixologezif.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zifasuwoberodez.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_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 17228 bytes
SHA-256: ec620999cb62da4ca74b8063590aca634d9705e00573a207b777e3798c22335c
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 10588 bytes
SHA-256: f6bfb4ccd70b3345066c982b2885cb1ec490a700b8f245224d62f52a7ccee045

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