Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb89a70ffec6861…

MALICIOUS

PDF

72.6 KB Created: 2021-05-03 20:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 053b037a2465b206730dffa19d67e004 SHA-1: 6ca6218c48389f06651e4100c2fada7e0c5e5852 SHA-256: dcb89a70ffec686119e79bc12b13b547fabd67bea0d06016fbce41d381472c91
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing or SEO farm URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially as part of a larger phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://resalured.ru/strik?utm_term=multiplication+tables+up+to+30
    • http://lazujifoxupa.getenjoyment.net/survey_on_machine_learning_algorithms_for_liver_disease_diagnosis_and_prediction.pdf
    • http://mofemaruwek.sportsontheweb.net/8202751477.pdf
    • https://cdn-cms.f-static.net/uploads/4475739/normal_602ff1d024def.pdf
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60278c1071da1.pdf
    • http://pararapameso.getenjoyment.net/67736728224.pdf
    • http://maxirem.mygamesonline.org/area_of_2d_shapes.pdf
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fd1c89fea46c.pdf
    • http://lifegirls.site/icivics_got_grievances_answer_key9r4uj.pdf
    • http://lerob.info/how_to_improve_data_skillssc3ty.pdf
    • http://tihefers.online/waxosesaboju1m83v.pdf
    • http://driveformclanemilwaukee.com/legally_blonde_junior_scriptsbrlc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_fc2db90aea034d4aa39b93c45d8c1594.pdf?index=true
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_22783f3a72a2406997e3f2f531e44f60.pdf?index=true
    • https://s3.amazonaws.com/mefonevimimix/flames_of_war_rules.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_8e69a3a2e56d4ed3b21a7c5f3180dec0.pdf?index=true
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_5fa1b438f3cb470b96a5d00dbc8b44b4.pdf?index=true
    • https://s3.amazonaws.com/kegovev/burger_king_fries_ingredients_2019.pdf
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_caa1296861e74cc6b87ffa387998189d.pdf?index=true
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_bce3d293072042cc9ffddc3879c8e1ea.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_06021fa332c047208bd32e143988b434.pdf?index=true
    • https://s3.amazonaws.com/firigugixujotov/exercicios_analise_combinatoria_com_gabarito.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaa.bin
8faf079734503ff3b5798176eb30449d9b6b1d7450fd8be9cd46d3734bdca900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 5284 bytes
font_01_sfnt_off0000efb5.bin
3307338931ba0f925eca45c5f96ec9278498ddd1aa13b96dc63239fa7cbdbce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 10472 bytes

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