Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43ee7819fef38ce…

MALICIOUS

PDF

78.8 KB Created: 2021-04-07 01:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb3ebe81fd48d3e5145735cab0b05e4 SHA-1: 98262046ac7fb157fbf379c48b4c50323b7b74c1 SHA-256: c43ee7819fef38ce2a4922b4f8d2099ab285fd5e536306f3a4f4b3f9898e4690
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=is+zojirushi+a+good+brand
    • http://shoop-fp.ru/20452573380cvdz3.pdf
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/5644432.pdf
    • http://gukiduwonaxinef.getenjoyment.net/risk_manager_interview_questions_and_answers.pdf
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/11f8e.pdf
    • http://kivafijap.mywebcommunity.org/chain_of_custody_form.pdf
    • http://juwaniwabi.medianewsonline.com/mapa_barcelona_ciudad.pdf
    • http://leafester.online/31571432956qg5m4.pdf
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/tuxiv.pdf
    • http://sfhgfje5df.xyz/okin_lift_chair_power_supply_transformer_sp2-b_kitjzzfq.pdf
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/7476350.pdf
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/75bd4fac51.pdf
    • http://wiwovurezibaso.getenjoyment.net/tchaikovsky_violin_concerto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/womirofop/charge_sheet_online_telangana.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_7979a49271854c568524567e5778fffa.pdf?index=true
    • https://s3.amazonaws.com/figidireki/kung_fu_panda_4_full_movie_free_online.pdf
    • https://s3.amazonaws.com/tirimofufemukat/mechanical_engineer_role_in_manufacturing_company.pdf
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_1437366830654f0cac088fdd5cc856c2.pdf?index=true
    • https://4b3c1411-62fe-4b74-ac0d-dad8ff5dd90a.filesusr.com/ugd/d10829_eefcd26bb67f48efb185f1f656380a77.pdf?index=true
    • http://kifesafijupesob.onlinewebshop.net/attendance_management_system_using_face_recognition.pdf
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8cf8d831e6f04791b10b3285788c14de.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_e7f62338e33741959e5a3e691b8f4a7c.pdf?index=true
    • https://s3.amazonaws.com/tobovunoberiki/20568244663.pdf
    • https://s3.amazonaws.com/wajibile/rikagibiritup.pdf
    • https://s3.amazonaws.com/gonima/manual_handling_risk_assessment_template_doc.pdf
    • https://s3.amazonaws.com/sirilagewuga/xonenupufepekofafazipowew.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_off0000ebdd.bin
5226c763f3d4f3cbceb38bcb13217c6b3d4a8982263ccab1e51df51dbcfe70e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 2900 bytes
font_01_sfnt_off0000f632.bin
6024d806544970fd93db08cdc435ed2e2a04c71dfb5468a74245449bf2091b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 5256 bytes
font_02_sfnt_off00010815.bin
0b8979525f32bcb7bb2e7fd9fc9afb12220ca7f92896e1c77ee9130f0b724f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10936 bytes

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