Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84b396bc71526c0…

MALICIOUS

PDF

329.8 KB Created: 2021-04-16 06:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6e5b6f32f682181bc289c6adb64a8f1d SHA-1: 804280e27fca19aa2b08b8e851dbd37179fed974 SHA-256: b84b396bc71526c0a5b3141cbc7af518961d5f1393efc95e5c30426a7b036641
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=67+camaro+repair+manual In PDF document text
    • https://cdn.sqhk.co/zukasedu/jzshDhe/50_games_in_one_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fd04fb899041.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/yhhZthj/monster_hunter_clicker_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/hGjhz1t/blockchain_explorer_bitcoin_testnet.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/AP5aidB/gl_assessment_verbal_reasoning_familiarisation_test_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5ffcde046e109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_6053a0a3bd42d.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/bXjeDjh/den_networks_annual_report_2018-_19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5fecee339821a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_603132c6237b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_604d8221748da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_6015ed68e6ff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5fc571188c625.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/aibMJji/super_god_blade_spin_the_ultimate_top.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/ggehiNC/woragabajomil.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/NSTeMia/28420725279.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/ihatLgc/12536384236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivufebolira.epizy.com/how_to_calculate_stress_concentration_factor_in_ansys.pdfIn PDF document text
    • http://suvalon.rf.gd/eat_right_for_your_blood_type_b_positive.pdfIn PDF document text
    • http://gamupuzif.epizy.com/bunting_template_design_ideas.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_off0004d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D72C 5040 bytes
SHA-256: a9ec0680fa4d2c51597149848c1f9aef160e5a6574ff8a86f9199c36a0cd80ae
font_01_sfnt_off0004e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E83A 14484 bytes
SHA-256: 1c448825a4bd69a8ebac4879f4cce498ef5a01417118e7c0d83d88474a22a1ff

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