Malicious PDF — malware analysis report

Static analysis result for SHA-256 6517019c7a5375ca…

MALICIOUS

PDF

92.8 KB Created: 2021-03-13 19:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dffbe7e794d969b9653eda1c042c344 SHA-1: d5d314f826cc5473182716556341e4c89c83e7d8 SHA-256: 6517019c7a5375ca8f1cfd31581f9b7b56fc64c53855e69a22989af7be4e8ae6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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-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://nipisod.ru/123?utm_term=free+1st+grade+math+coloring+worksheets
    • https://geguguxe.weebly.com/uploads/1/3/4/5/134513061/buvonosidur.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/zizurex.pdf
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/nonigizumarapabeki.pdf
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/5e52545.pdf
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/sinapezefabud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lararof.rf.gd/wojobopomubekan.pdf
    • http://fevoroxigur.rf.gd/how_do_you_make_an_isosceles_triangle_with_a_compass.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_686b556933ec441e99a8434594590628.pdf?index=true
    • https://s3.amazonaws.com/bipovoromoj/how_to_calculate_the_molar_enthalpy_of_vaporization.pdf
    • https://s3.amazonaws.com/pulavokaxe/nemiwegikodisuku.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_451715180ada40989c5ef5f675e80147.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/algebra_2_worksheet_linear_programming_word_problems.pdf
    • https://s3.amazonaws.com/jovekus/21467244460.pdf
    • https://s3.amazonaws.com/juliziwojatige/72115355512.pdf
    • http://taguminuligifis.rf.gd/boy_like_you.pdf
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_1a79b0ebb7f043dc94b7f1447cc644c9.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_f248b5e38acf406199017e54079b0360.pdf?index=true
    • https://s3.amazonaws.com/fajetufekejo/95391846691.pdf
    • http://wudafozejuniv.rf.gd/clicker_heroes_outsiders_guide_1._0e11.pdf
    • http://finedigijuparab.rf.gd/11221427091.pdf
    • https://s3.amazonaws.com/vuxagixil/montauk_shark_fishing_report.pdf
    • https://s3.amazonaws.com/wizuluworafid/aiou_solved_assignment_spring_2018_fa.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_off00012f55.bin
56651a6cc68e9c1cd8e7b348d7ae1f13bcfb8d1acf4f1fcc176c6cad9a473201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 5516 bytes
font_01_sfnt_off0001420b.bin
01c1d0f1e63aaca66872c1476836c287ea5cce6047b4f51a4ae7b7765eb90943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 10540 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.