Malicious PDF — malware analysis report

Static analysis result for SHA-256 20714999c4b25660…

MALICIOUS

PDF

79.3 KB Created: 2020-11-22 21:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 523401c53bb0a0f8f53b3183affea9a9 SHA-1: eb6f267bb1b0ff2f12ec5e235549da665c465ba5 SHA-256: 20714999c4b25660c8d07fcc757dbfded456da2560942d3d4d77b66eb8e1985f
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to redirector infrastructure and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=classic+bulldozer+game+free++for+pc In PDF document text
    • https://resedofuza.weebly.com/uploads/1/3/4/5/134503764/mumuzetu_xokotajijuv_muxuj.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/zifupa.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/tomexewog.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/tigovatolis/feduzoralapijizitipe.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/clicker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/autofocus_in_manual_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/looking_at_movies_3rd_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/hacksaw_ridge_full_movie_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/english_grammar_book_filetype.pdfIn PDF document text
    • https://s3.amazonaws.com/xanofamaja/cheat_codes_for_1v1_soccer.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/polububonisijafazutelazaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/82991647538.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_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 5568 bytes
SHA-256: a6b2c921f20c30b979d2bf49bab88e67c3ef69636e4f47b45a1733e7fd822d68
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10660 bytes
SHA-256: 0e896176f220b64ce6ed4d0f5413b85f58a13b88b044e5dde50dc43f5c28b257

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