Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d455379201ea33…

MALICIOUS

PDF

79.4 KB Created: 2021-05-26 06:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 963425cc2837f32b77a1e3d009d98a24 SHA-1: e44537da6b45758def5ce029bd320365ffbd16f0 SHA-256: c8d455379201ea33c047b5d887cf4b642ccd0358631a7e7189d0562e38e08779
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, which is a common tactic for phishing campaigns.

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://gimoguvi.ru/strik?utm_term=how+to+insert+cleaning+solution+in+swiffer+wet+jet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449776/normal_5fe61bb502263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_6062995b13035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_604950a131df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60371cbd1dca0.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/dbe0bb40-7e20-47b4-ba32-e066ccd545aa/data_analysis_worksheet_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20922520-6479-4d54-a66d-c69a24b93907/can_i_still_apply_for_fafsa_spring_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3c21a6-cb8c-4ce3-9ad3-b65ec3a5cb39/69825296076.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/which_bank_has_the_best_home_equity_loan_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20196a3c-87a1-4dca-afdb-eb1f788e173d/gotidukebamixexabibegite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71c2edb-9224-4454-9f5b-204b519c8476/gitajizaluwinezogurunawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ee6ad4-9da5-4715-b593-44e908098cfb/20496228162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c85aed7-a01b-4cc5-8ec2-d2618bc362e5/buwozapapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5234018b-02ba-4d67-ab87-cb7eb86f54e5/hp_officejet_7610.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/40287060249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e8ec2d-34dc-47c5-9cb2-df6a035ca09e/govawexuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5724ce-497b-4c3b-b537-43e92df75d7b/wajuwulokubilupawun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a48118-03ae-4b34-9bae-ab4d42d06b14/rulipukurijuluvinori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82c08ec-0add-4a84-914f-15d33f1fc591/how_to_create_a_story_structure_bbc_bitesize.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_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 5176 bytes
SHA-256: 77af8579a045eaa1300210037d42c08b100cb492cd9647bec8c9e0ad189ea548
font_01_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 11004 bytes
SHA-256: 2318c66a37de66af88fceee83faa76723b474756b00b8c2fde1b18f96d8fc48c

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