Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bc8b4abd30f053…

MALICIOUS

PDF

78.6 KB Created: 2021-02-11 15:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4202f24de4e43f262b0480d3dcc400c SHA-1: 600fd5a08d892defbcd5ebca3cda657c8b22c7be SHA-256: 61bc8b4abd30f053690f72443f82aa5c2e5a5d1f522064c441fe8721d97c4f04
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Nikon n80 owners manual'. No scripts were extracted, but the presence of an external URI and the overall detection profile indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=nikon+n80+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fd03919111a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fcce61fdee7a.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/5iajaN7/race_car_driver_killed_in_plane_crash.pdfIn PDF document text
    • http://jikovuruwigifan.iblogger.org/51946171894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_6015e6fd3a9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a9af2fb13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd60f7dd6c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_601e2d992636f.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/wusone/graphing_cubic_functions_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/5555525344.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/paper_crane_origami_template.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/google_presentation_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/immigrants_in_our_own_land_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/fegabaviwafabefaka.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/7880743596.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/custom_two_part_carbonless_forms.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/zasatilorilipefomapel.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5292 bytes
SHA-256: 8bfae62c01b9b622c5fb4c068e698bdad8a207024e227175c84c92f488fe5f9e
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 16684 bytes
SHA-256: 2dcfa16ec5480a9bfb0a00fda954270c5dc6b982b4a2d84ecefe0364fd35aed4

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