Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba527fc786dc7bb…

MALICIOUS

PDF

272.4 KB Created: 2021-04-07 05:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6d07a734d7ffe32e77c74c8f90331f67 SHA-1: 04a3f291a62414a1f8a2a5edc4d85c23bfb81f2a SHA-256: 8ba527fc786dc7bb6888b8c6167c2cbdbd8f3d9ad6fd01b7df5cdccbb4649b01
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier as malicious. It contains an embedded URL pointing to 'https://golowaki.ru/123?utm_term=altium+designer+student', which is likely used to redirect the user to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the URL and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 4

  • 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://golowaki.ru/123?utm_term=altium+designer+student PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd04a0cdd1.pdfIn PDF document text
    • http://pubguckazan.com/35113174174zbouz.pdfIn PDF document text
    • http://santecmb-sarl.com/top_5_pellet_stove_inserts2dcgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_5fe8d55ea07f4.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/UE4gcqs/varinigudunivokulitu.pdfIn PDF document text
    • http://pepojen.iblogger.org/cyberpunk_2077_frame_rate_xbox_series_x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_5fdc16d68b6f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fd660952e5a6.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/eWjbjdv/super_retro_16_apk_full.pdfIn PDF document text
    • http://hangzhoumetal.ru/426135418021pqle.pdfIn PDF document text
    • http://begetus11ppz.xyz/ti36x_pro_fe_exam39vq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_606395d1f2cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_606529de2a738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_605c3bffefb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6011d3b5229b2.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/ZjbIphh/78090011350.pdfIn PDF document text
    • http://zafumeze.iblogger.org/what_is_the_best_air_purifier_for_a_large_room.pdfIn PDF document text
    • http://fatogotem.22web.org/87983458322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81720c07-ef50-47cc-80f5-3dcc2eecc59e/metapesufifexuruxevuje.pdfIn PDF document text
    • http://dobejul.epizy.com/fokigiwuxumirafefebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85abad3-8f14-4eef-993a-7de45184a337/line_6_pod_x3_live_price_in_india.pdfIn PDF document text
    • http://tuteninuxad.rf.gd/c_language_programs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c869c6-e8bf-4b9a-a8ee-1e93bd499f10/5_4_3_2_1_coping_skill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2081ba12-2ad5-4e26-ac90-d2a746173c40/50037072687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39765e07-9ebd-4572-92c5-645c22ffee97/what_is_grantor_and_grantee_in_real_estate.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_off0003fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FA04 4924 bytes
SHA-256: b68b8b625c85bd60f6eec7746218ae7a9755c4974b5412ce9644c0916136fe1d
font_01_sfnt_off00040ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40AB1 11716 bytes
SHA-256: 2be4ee66b9e6fe0f6de56d59fa3945e9f9d60965591265f26d1d779ed2f7a8ad

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