Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b16ddfcfb51e61…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 08:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc794259cc1167323d59723916081e9 SHA-1: dbe1785b65cfd78174e1b08a0c09f5dca0873732 SHA-256: f4b16ddfcfb51e613b55e3a9de0902673cd6bcd807b8ad3d72ecdbf29a45df26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, including one to 'jumiwimov.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=syringomyelia+adalah+pdf
    • https://cdn-cms.f-static.net/uploads/4482648/normal_6032c5d50b491.pdf
    • http://zagavogafewakud.iblogger.org/13357968945.pdf
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fd858ab41462.pdf
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6021725b28b5a.pdf
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fe39d6fac2a9.pdf
    • https://cdn-cms.f-static.net/uploads/4445338/normal_60660d3abb013.pdf
    • https://cdn-cms.f-static.net/uploads/4465010/normal_6065dd6d7c29e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_28990fab5cb047bbb79db75326d705fc.pdf?index=true
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_86bcd481fc464091adb4c5865e895242.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_f466b84dc8c04821954503b80f46c113.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_6e9bbfa73c454ed78c78cd616c820e94.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_decf4ff2614f4cf98c5c7aa116798cb6.pdf?index=true
    • http://fisavisifesu.epizy.com/nouns_worksheet_for_class_5_icse.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2a2d6aaf2bd74a37869a0438ca081565.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_c9e7a6ee2c9c4acc85764a50cf9aa3b5.pdf?index=true
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_e6d8521c288645fba06a94646e33fa9d.pdf?index=true
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_921d9271333a4b5c905d4769b94c7106.pdf?index=true
    • http://dipusoxitiruvu.rf.gd/new_moon_2021_dates.pdf
    • http://segoxegigo.epizy.com/sowewujizuvuxilo.pdf
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_91e49f7263204b09b5ebc97a115eac2e.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_4b7dc4852ee7484f8155618de69412df.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ccf.bin
4793adc76459b58b35a1e35ebcde63d77b21b00affa6111d0c2d5b1147e66ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 5484 bytes
font_01_sfnt_off00011f53.bin
2791470008dceb05d4e6aaf992d8069660ad3dc2dc5061e8d516e291330ac52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 12904 bytes

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