Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de5e429856a8900…

MALICIOUS

PDF

85.4 KB Created: 2021-04-03 12:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9489f5449e63f8e12b3d0d663b02945f SHA-1: d47854a85025836e00d38ad0b117ff0c646496d8 SHA-256: 2de5e429856a8900ecb70eea105205c851cbc36275c23d2ee515b027a71aa28a
156 Risk Score

Malware Insights

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

The PDF contains a large number of generated SEO links pointing to various PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=weathering+of+different+rocks+gizmo+answer+key
    • http://dfwshootersupply.com/wovukatory.pdf
    • http://alex-chekalev.com/zoluseruswm2m.pdf
    • https://cdn.sqhk.co/jezumasulej/hcLjaia/nexudarewomixetikot.pdf
    • https://cdn-cms.f-static.net/uploads/4421939/normal_6017b0d52af51.pdf
    • http://eyebrowthreadingdallastx.com/gugumemojelujojonimezegoqez3a.pdf
    • https://cdn-cms.f-static.net/uploads/4368505/normal_60209c57119c0.pdf
    • https://static.s123-cdn-static.com/uploads/4365584/normal_60066c28e9db7.pdf
    • http://sutovuresas.mygamesonline.org/bridges_in_mathematics_grade_3_home_connections_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4376382/normal_60386746177f0.pdf
    • https://cdn.sqhk.co/wapogade/bghgdpn/homeostasis_adalah.pdf
    • http://dle-tpl.site/jarajofodixpkp3y.pdf
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5fd8555cb55a8.pdf
    • http://noxaduva.mypressonline.com/better_man_tab.pdf
    • http://detonic-official.website/83796152435bi42h.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_606351fdcd701.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_605f2a898836f.pdf
    • http://biwedujurar.mywebcommunity.org/murders_on_the_rue_morgue.pdf
    • https://cdn.sqhk.co/xagaxubibiz/EicgfQQ/fuxewilatejupabolikorog.pdf
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5fe83dd9d14e2.pdf
    • https://cdn-cms.f-static.net/uploads/4484993/normal_60118ca4d2c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4466370/normal_603ea087c2a3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_6618a50737354ca58368a0e8158db777.pdf?index=true
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_7f78412ca2134a16990ed25a775b9e20.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f94b.bin
21f2afb7d9076494e62fee530fed5fd62ab1b082aa3a86d11187e5e1288bec52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 5724 bytes
font_01_sfnt_off00010ccb.bin
16fcb78276836a897e15894742c48de20b5e19715897937997175c8c7d072273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10816 bytes
font_02_sfnt_off000131fb.bin
c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16144 bytes

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