Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a90af98397e09ca…

MALICIOUS

PDF

67.1 KB Created: 2021-03-25 10:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 67e668f5e797d2a2b5046a7e8fbbbc74 SHA-1: b68c4deaace119872a2c5df78cd06ca9059f11f0 SHA-256: 2a90af98397e09ca7494abd8c1c06517f04633ba8e69a053422e811e049ff802
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 URL that directs users to a suspicious domain, likely to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for social engineering.

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://dugedepap.ru/123?utm_term=nursery+alphabet+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422392/normal_6036c3eac908c.pdfIn PDF document text
    • http://business-open.online/telotitizefogaxuturub11hx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_603fedadbdfd2.pdfIn PDF document text
    • http://italy50wow.pro/11th_chemistry_volume_2_book_downloadmt27u.pdfIn PDF document text
    • http://securityverifiedservices.com/goods_on_consignment_agreement_templateqi7nn.pdfIn PDF document text
    • http://bilet-pdd.site/autocad_electrical_drawing_template91bwd.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/xomudufe/97996925460.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/zetirezarumibotulakik.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/spatial_data_specialist_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e4c93d-3833-41c8-8fa5-6822eec67e08/jocko_willink_favorite_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/2008_porsche_cayenne_gts_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/fokuriduxazuzetin.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/who_is_jairo_in_counting_by_7s.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/35634707873.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/chamatkar_picture_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce3a642-e20f-44b2-a3f1-51490ff88796/how_to_repair_leaking_karcher_pressure_washer.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_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 5496 bytes
SHA-256: 6f76b6d2d8e181495d2a79d1abe25d1f5565cae3c6fee47088508783842c3b7d
font_01_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10124 bytes
SHA-256: 05ebcdda1ad6d6b24481c1c2aa979b0d07245c56aa8c172f2617466da9a9c8b5

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