Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a22364e57cd1dcf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 11:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2d9583f91bb28df3bff9b2a2126b789 SHA-1: 7008e8199f05e546fa5019566f555d26cba737c4 SHA-256: 3a22364e57cd1dcf62660d07bbff9e84d5a4e51ffb3a717416da0f7d3889b1b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external domains, many of which appear to be link farms on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=how+to+delete+system+files+on+android PDF link annotation
    • http://www.bsa.by/ckfinder/userfiles/files/bobanusipelizidova.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/72343570987.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614184c818619---2410698731.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/juvopalo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/80111351995.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/vuvazoxatuxazok.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/82264240359.pdfIn PDF document text
    • https://udruga-invalida.hr/files/57424569095.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50434828676.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/sagurafir.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/39604956525.pdfIn PDF document text
    • http://isvpro.com/custom/files/medifigixedetapojado.pdfIn PDF document text
    • https://argumentua.com/i/file/76412042386.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0ab65d7929d21af322f82713b97c94c8/82725372999.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/45664863958.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/rejab.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/xitajigufor.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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 19340 bytes
SHA-256: dfde9aa7ed6b2fd0e1c198327dc1aabbcae225eb7f0bda85860432ae98347da1
font_01_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10704 bytes
SHA-256: 97945b8c582a40c77b9716eeb5774273ef33ba90e3e286441624ac72eb2e2797

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