Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33424884b1a58f8…

MALICIOUS

PDF

109.0 KB Created: 2021-03-16 22:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d917063519aecb954bb293b08e3f189a SHA-1: 284c59d22ee60c78e342eebe38405c64c8f7f6a3 SHA-256: d33424884b1a58f874d4f0449de09b3e281856653997b7a5f31bfdabbabc60ca
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used to host a phishing page or download further malicious content. The document body appears to be obfuscated or corrupted, but the presence of external URIs and the high-risk verdict strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=emmitt+perry+sr+house
    • http://tanijijud.sportsontheweb.net/92339505263.pdf
    • http://koreanluxe.com/vissani_7.1_cu._ft._top_freezer_refrigerator_reviews1rvga.pdf
    • http://big-ita.space/64120691472e84i1.pdf
    • http://sezejawi.mypressonline.com/fotuwibuzuvatudedunupo.pdf
    • http://figuxovutofid.mygamesonline.org/sefunirubemigopas.pdf
    • http://xepuxesadara.mypressonline.com/luridixunozifasojupumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lukepepe/st_benedict_s_school_whitehaven_ofsted_report.pdf
    • https://s3.amazonaws.com/saziwijaxodav/circumference_of_a_circle_worksheet_doc.pdf
    • https://s3.amazonaws.com/sixenogafopoj/36645437974.pdf
    • https://s3.amazonaws.com/rerinago/job_interview_questions_and_answers_for_receptionist.pdf
    • https://s3.amazonaws.com/mejifavo/sheets_app_for_macbook.pdf
    • https://uploads.strikinglycdn.com/files/6c351834-8bf4-445f-b6b4-cfefc7db05d1/30918158095.pdf
    • https://uploads.strikinglycdn.com/files/cdcf26a4-a4b3-4ad5-9af0-2a9c8b5e14ae/86048751649.pdf
    • https://s3.amazonaws.com/dewutexorob/wudati.pdf
    • https://uploads.strikinglycdn.com/files/3038e65c-fa08-4d70-930c-a80dcecab29c/is_one_punch_man_on_vrv.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/59459495874.pdf
    • https://s3.amazonaws.com/woxotopapozokev/is_2005_honda_odyssey_a_good_car.pdf
    • https://uploads.strikinglycdn.com/files/acdf539f-ad1f-469c-9315-6de1a0b431d3/icewind_dale_2_secrets.pdf
    • https://s3.amazonaws.com/nuxomigo/matlab_plot_circle_points.pdf
    • https://uploads.strikinglycdn.com/files/87fa2340-a1ef-43b2-a8b0-8f9f064deb76/81861497964.pdf
    • https://s3.amazonaws.com/tubupejevomo/writing_equations_of_lines_from_graphs_worksheet.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f10.bin
abf5611d5320b823bb859e7a8c535df45c31bb61ac1817b4e5131e45c57b7549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F10 4652 bytes
font_01_sfnt_off00016ef1.bin
613f5a2cdc6829c48d1fcb0f3f290f80b9133fed0c88791acf8ee1e21d70923c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF1 11908 bytes
font_02_sfnt_off00019755.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19755 4324 bytes

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