Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b90d53c610c0f1…

MALICIOUS

PDF

79.8 KB Created: 2021-03-30 00:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f3d41c86049e9d80445d4a6ef281f2ea SHA-1: 1e8f19893cb2e9857b9aca805c0734e6f43e1e94 SHA-256: e5b90d53c610c0f1a00d78fe46586493bba25e8a10ede6849bb31a42bfc6b865
156 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 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 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.
  • 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://baarspo.ru/123?utm_term=falsifying+timesheets+california PDF link annotation
    • https://vimedijo.weebly.com/uploads/1/3/1/6/131606629/dikemowowel_gujetibevapi.pdfIn PDF document text
    • http://zexawabezazojot.sportsontheweb.net/the_eighteenth_brumaire.pdfIn PDF document text
    • https://nozubewow.weebly.com/uploads/1/3/1/1/131164313/bc80746d0d.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/e9853.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/foforak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_2f58f614c6e54891a39611d4b1d46338.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/the_ascent_of_money_episode_1_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/abcd_2013_movie_in_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/lilovipunizolid.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/69092336166.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_c8680560a6854a43a2a6952a3c4bd911.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/liriwekunovuzedesatagal.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/opciones_corresponde_a_tipos_de_sistemas_operativos_existentes_en_el_mercado.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/time-domain_finite_element_methods_for_maxwells_equations_in_metamaterials.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/nanowe.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/vanogipopujiwizomoledisin.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/18930163151.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/is_thor_son_of_odin.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_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 5352 bytes
SHA-256: 295bbf7b466665babd4339c62c069ddc360e0546451058d5ac1eabda5dbe49a9
font_01_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 10592 bytes
SHA-256: e8be0dcd8b28ba4f18ef7c8fa5438bd03d66419d206b5a940128adb50810e96f

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