Malicious PDF — malware analysis report

Static analysis result for SHA-256 8327556fefc887d8…

MALICIOUS

PDF

86.3 KB Created: 2021-03-11 11:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b4c15ed735f654fc8821ba61bf13136 SHA-1: 97f8e878f6773a9583276ece85b2f2d34d790921 SHA-256: 8327556fefc887d8f63fc5699b635e13466379bbb876b7118e41d86b645f1e96
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, many pointing to other PDF files hosted on various platforms, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=alphabet+tracing+book+pdf
    • https://mutixuvuv.weebly.com/uploads/1/3/4/6/134665255/406685.pdf
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/gakez.pdf
    • http://pozufopajosel.mypressonline.com/71377005529.pdf
    • https://cdn.sqhk.co/kizajituxab/hTAMI6f/american_horror_story_ringtone_free.pdf
    • http://bopugafuwu.scienceontheweb.net/xbox_live_error_code_8015d002.pdf
    • http://bizowokare.getenjoyment.net/48480557431.pdf
    • http://sunugukumota.getenjoyment.net/95239297165.pdf
    • https://cdn.sqhk.co/zanotunuzi/hjieUgf/thoracic_outlet_syndrome_treatment_exercises.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/wewunezejo.pdf
    • https://cdn.sqhk.co/mevazasid/JpXKaii/nike_outlet_near_me_sale.pdf
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/4590059.pdf
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/vugelufelegejeroz.pdf
    • https://fofomobagukewe.weebly.com/uploads/1/3/4/3/134352826/pivafo_puxowadakarudor.pdf
    • https://cdn.sqhk.co/foxezevewa/oIxgchi/92814331958.pdf
    • http://gazozasi.scienceontheweb.net/votomirar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kakasis.onlinewebshop.net/bokinugebelimovidulop.pdf
    • http://madepadejatutof.onlinewebshop.net/saxolibaraxoxamaga.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df92.bin
5245b4eec09316478b640e6e15d71d1d7e082a22a58e685774a6e1baa83e70ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5432 bytes
font_01_sfnt_off0000f1fc.bin
5564a649459b90e9c6f0602ab21b6cd8cbc89b2b4295a9bd58485e285811caf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 8376 bytes
font_02_sfnt_off00010972.bin
3f5e84bc3b1c4a2f4697c5035a1146f10dc82d63b23e8476b8d0503fdf3c7ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10664 bytes
font_03_sfnt_off00012e23.bin
a0f91dd884ae6e41972b31fe3d77a3fa971159b31faf874f7a11b9cf065ce13e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16316 bytes
font_04_sfnt_off000143ba.bin
551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143BA 1736 bytes

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