Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a3f429f7a7113c…

MALICIOUS

PDF

73.6 KB Created: 2021-04-20 05:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84540c1a24c86cef5f4ab96645cd1c6f SHA-1: 10a5fa7019d7ce3691ff2f666eda1964fa8ec0fe SHA-256: 33a3f429f7a7113ccb68ee6bcec9fcf5ffeeb00c11795e63d94cc020e041ebe7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+properly+mount+a+dishwasher PDF link annotation
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/671177.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/felexavatol.pdfIn PDF document text
    • http://jerugujekema.getenjoyment.net/dadumimofapenu.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/bihar_stet_previous_question_paper.pdfIn PDF document text
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/6216470.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/zivimukowadirawulifanidu.pdfIn PDF document text
    • http://zibukebolavor.22web.org/49546397521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxumejaxumem.epizy.com/kitab_nasab_alawiyyin.pdfIn PDF document text
    • http://deguwesipi.rf.gd/aseptic_process_control.pdfIn PDF document text
    • http://pibonev.rf.gd/nufexuralikod.pdfIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_ea252feda71b4aeebccc4690681eda2a.pdf?index=trueIn PDF document text
    • http://verekoxamokit.epizy.com/how_to_fix_weight_watchers_digital_scale.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c6c6eb58458c4a7181bb8efd88646df7.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_f336e678f61f45ddb6113521f4074fd3.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_9ed30389ed674d309a8d3142bc6517b8.pdf?index=trueIn PDF document text
    • http://fataragoreb.myartsonline.com/scrambled_sentences.pdfIn PDF document text
    • http://zabuzuko.epizy.com/binder_covers_and_spines_templates.pdfIn PDF document text
    • http://misanedajog.myartsonline.com/1968951414.pdfIn PDF document text
    • http://pavapivujuv.rf.gd/mastering_elliott_wave_glenn_neely_download.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 5356 bytes
SHA-256: e11d770bc39ba895c5198d936d53927e02b110ac70ddd666c1be67f4cf245abe
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10652 bytes
SHA-256: 3191dd3da1d25974e786a3294f6a0b4a76593710278db89f72e9fbd445cfa3b9

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