Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b3fb4e8a69bede…

MALICIOUS

PDF

72.5 KB Created: 2021-04-03 18:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0512b405de6186b123ef241ba2aa6dd7 SHA-1: 5cc8eabc425376226a82b29c45189f18b1ce4d32 SHA-256: b3b3fb4e8a69bede51106b2428b81055cde9fd2484f597d57cee9ebec7cab36a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate it is likely used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=el+cerebro+que+aprende+libro+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456377/normal_6016e50a40073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_600a677476dff.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/9829d8fbd6db91.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/jbZhgih/world_beautiful_girl_full_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/tiigfMU/residual_value_formula.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/bowagizegifokasagabi.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/saswara_veda_mantras_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/chbgi1J/hearing_impairment_ielts_reading_answer.pdfIn PDF document text
    • https://visameme.weebly.com/uploads/1/3/1/6/131636817/4334882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_605b0d225dee7.pdfIn PDF document text
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/4856488.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/8hchaib/red_dot_sale_2019.pdfIn PDF document text
    • https://wuwepila.weebly.com/uploads/1/3/4/3/134371533/lixasiredo_moxenekigotido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_601e3c5545ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/8Xgfsr1/nivikefejudunuginatadago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_8e8cb2e1a387404c8421fbcc97bcb4f9.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_3a0ca939382b409ca9e32df4925118ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e39944d-34da-4d0b-b917-a6d6547c4044/gofonigugerivibif.pdfIn PDF document text
    • http://vawanumezal.onlinewebshop.net/96297955321.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_f5b848dc813e41cc9581e80a7f721fc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6c6db4-a833-456f-b616-c001a66b34f3/what_were_the_economic_arguments_for_imperialism.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/74994346995.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 5192 bytes
SHA-256: ff9a89b2e4cdebe6cf7ca73899803e0d3c2a287a7b00fcd57e8a08ee13791811
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 11708 bytes
SHA-256: e4437de22e30ab4e3052b37e57b3d43703ba7f45bf9ff49113345a6e9693ed26