Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb73a21ae3922dd…

MALICIOUS

PDF

78.7 KB Created: 2021-05-14 03:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 709db66bfd8876a5fe2045152b82c1cc SHA-1: 6f59e6fbd424d26548ad73c5c8ef01b2d6ef4e03 SHA-256: dcb73a21ae3922dd90e2831e1b299dd2698a073fcec5accf1376be70dfcabaeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDF documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+get+disney+plus+on+lg+smart+tv+2015 PDF link annotation
    • http://juwupexutaval.mywebcommunity.org/what_is_the_lesson_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/249e6705c9e8fa2.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/84263864107.pdfIn PDF document text
    • http://xenojupu.mywebcommunity.org/kosiwaluzikosizi.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/atlas_world_map_free_download.pdfIn PDF document text
    • https://boforotove.weebly.com/uploads/1/3/5/3/135393238/tojoba.pdfIn PDF document text
    • http://pakaxofuj.sportsontheweb.net/37384163676.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/rizijubovapuk/english_grammar_worksheets_for_class_3.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/energical_visiophone.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/98674523257.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/1961812374.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/what_is_newtons_laws.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/ccs_university_examination_form_fees_2019-_20.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/pinotim.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_3f6adc922170428bbe4a5b8f8f827978.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/28509562516.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/68128277744.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/microsoft_projects_2019_download.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_b542771b2d234a6bb4e0bec6bff932de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/fitness_meal_planner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/factoring_greatest_common_factor_polynomial_worksheet.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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5944 bytes
SHA-256: 74f0d4c829aa08583104a22b84ae8bfa4e85074c43ccc7edb34724d1ae795404
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10488 bytes
SHA-256: 0027196992cb99fd4660e70088d98c361ad7e6dab9dcccc0b62de5635c4024ee

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