Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c6c9bf8a0225a8…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 00:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 35514ad699911c570544fb23bac737b2 SHA-1: d74361748c1d058fb14d808fb3058939317855a8 SHA-256: a6c6c9bf8a0225a8b65a2b03453d2468f873f3b66cc981307ad1b0b2764d0adf
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 disguised as study materials, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+study+for+sat+math+subject+test PDF link annotation
    • https://cdn.sqhk.co/lanuniwa/jajdhhT/ropelekumabi.pdfIn PDF document text
    • http://gexezagabakit.22web.org/black_spiderman_wallpaper.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/luxuxogixuxefo-lazusi.pdfIn PDF document text
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/30321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noroved.myartsonline.com/mackie_dl32r_manual_espaol.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/how_to_teach_basic_paragraph_writing_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/trial_fusion_xbox_360_iso.pdfIn PDF document text
    • http://ledugezutixajo.epizy.com/zojavirizalewubem.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/70488313949.pdfIn PDF document text
    • http://meziwadosemuge.epizy.com/xeribalidamezonumeme.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/fagudaxewatunokol.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/15827620652.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_do_a_budget_in_quicken.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/3d_printing_filament_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/certificat_de_vente_objet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/equivalent_fractions_worksheet_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/bose_companion_5_driver_windows_7.pdfIn PDF document text
    • http://jeneviwa.epizy.com/6957030884.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/wayne_dalton_garage_door_parts_columbus_ohio.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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 5600 bytes
SHA-256: 0dd5df98833efbd91e38f29c7ca974b82e98e8ccefedff7ab8e2eff18a8b4994
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10728 bytes
SHA-256: 7f6315b12c2841b17b76526ff3a6c1413827733d317cc5821d2e77d387ddc9b4

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