Malicious PDF — malware analysis report

Static analysis result for SHA-256 a340abc452d8f482…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 19:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: adfd25b0766e3bd7cb1c165c7cb051c9 SHA-1: c9e45f051b745351834237175b6ab0a15db42ad3 SHA-256: a340abc452d8f48251129e8650a3b75c10053a51a03adcb7f250789d6e637e9f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one, 'https://jacksth.ru/award?keyword=descargar+pdf+adobe+reader+gratis+para+windows+7', appearing to be a lure for downloading software. The PDF also functions as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=descargar+pdf+adobe+reader+gratis+para+windows+7 PDF link annotation
    • http://milanomoda-italy.website/bogurewodci7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_604fce812ed4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fe452efa5d28.pdfIn PDF document text
    • http://storedubai.shop/differential_diagnosis_of_common_complaints_test_bankm693s.pdfIn PDF document text
    • http://sobakin.space/gcse_edexcel_maths_equation_sheetx33jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_604fd0a0e1485.pdfIn PDF document text
    • http://momentikshop.space/how_to_turn_on_farberware_coffee_makerlzxbw.pdfIn PDF document text
    • http://nesobaka7.xyz/wow_inscription_guide0qe1k.pdfIn PDF document text
    • http://on-arenas.com/sejetasoxoxomuaft8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5fc8a4b09f0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6012dab78c787.pdfIn PDF document text
    • http://varistop.site/what_is_the_divx_vod_registration_codetyp47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_07e3d64b071f4593af89aa8fdb3eb4e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9760d9d2-d2b5-428b-8e32-45e632c1a10a/zagategi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14022363-3f47-4bb1-96d2-36f25b1ca461/2005_mercedes_e320_cdi_service_reset.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_ae21edff6b2a4ce5b6a3301af5464bea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc3a630-84f7-42c2-8bd7-0b37853646bc/sefudotare.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_a434a9fd5ec742b9b24fef74497b29b3.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_1a9dc5d6ba614bcfb7021121ab4c4eae.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_584ba0677d684d6cbd04e8411b650a63.pdf?index=trueIn 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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5600 bytes
SHA-256: 1f837c19b36b600c3f2dd9380e494ece3a49d4a51c23b60fcbb129119d85fd5f
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 12028 bytes
SHA-256: 4185246b951b110961440ea374e172742b1da9184a581497f4b9553964041edb

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