Malicious PDF — malware analysis report

Static analysis result for SHA-256 9385dce00a56f185…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 58a11071c9a15f8dccd0a8ec1fa3db1a SHA-1: 6d80b02748ae1c89df6d07879b2d359837a70a36 SHA-256: 9385dce00a56f18568f2b7c4084c89f2c0fff65e1a4a4e3c0fbef44444fddcb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain ('seumenha.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification confirm the malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://seumenha.ru/strik?utm_term=vantrue+n1+dash+cam+review PDF link annotation
    • http://kusukeluwabe.mywebcommunity.org/boduwilafe.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/how_to_get_darkvision_5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600b68cf71601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_60602e3788d62.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/nespresso_use_own_coffee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_605f2c25b177c.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/tesovaturulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_601964bd25d39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/fishing_report_missouri_river_craig_montana.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/68115567345.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/robuj.pdfIn PDF document text
    • http://jilabof.epizy.com/93946866395.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_1d5a3135aec942ed91be4be6ee2d9e1e.pdf?index=trueIn PDF document text
    • http://xefezude.epizy.com/liwobakelesiseradasa.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_daad2e8ef048452c8162d4e2d854977f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19e717b-649e-42d9-8245-3770db6f72e4/motorola_t325_bluetooth_pairing_instructions.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_ef23f770e1714285b211229f2401573c.pdf?index=trueIn PDF document text
    • http://laribemexomog.rf.gd/xitomeresi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bfcc58-e2be-48e6-9da2-88218bbca614/sony_rx10_vs_rx100_vi.pdfIn PDF document text
    • http://legabukev.epizy.com/can_i_study_english_and_work_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b278c043-848c-478c-b13a-8bcacd213e62/vatavulebewamivebiva.pdfIn PDF document text
    • http://xupimegoroze.epizy.com/69527426666.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/vewelaxewokotoban.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/interview_questions_and_answers_for_service_coordinator.pdfIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_3e0a9f9c742748788de2c9a69f1e6d33.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_ac74a5c668ff45108590ee545cf37ddb.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_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 5316 bytes
SHA-256: 5e771d98ab6a903c61d25923e7713ac1f3fa8d0c4efcc6ff45d954dcb190fffa
font_01_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 11088 bytes
SHA-256: f62374c1bff765ec506160f773bb7de932b7c36e868112132110b63bd362ef14

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