Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f6ed612ad4e6e1…

MALICIOUS

PDF

73.0 KB Created: 2021-02-21 03:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fcf850d34e1f79ef00539344510bce39 SHA-1: 986c01bb5139e0a7d4042254ee9b0414b2be0ac9 SHA-256: 59f6ed612ad4e6e133a3967e107067f6e2f1d069596eb81325ce7e21b6d9d667
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'crophysi.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • 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://crophysi.ru/strik?utm_term=simple+logic+model+examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_601abd5812156.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/bM6gfbw/king_kong_full_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fdfdcf5ad8e0.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hjje6a0/maze_garden_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/gAjdJZC/programming_languages_ranking_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_601bc77da8b62.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/IDiciei/to_mars_and_beyond_vbs_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/TjdYOTr/xitobajababutokaropila.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/sinadi/zitavedowufun.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/dmca_takedown_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/sovuravowume.pdfIn PDF document text
    • http://mefetapa.rf.gd/jekufatifelowakewewugases.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/ratujusuwabakokilunejen.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/online_education_responsive_website_templates_free.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 5468 bytes
SHA-256: 2707bcfcd3ab589c0d1eb66e8fb1cdfe80123d2f266dd64eaf310359b535b523
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 11052 bytes
SHA-256: 465adcf894cf1b2d982d1759fbf99a75fd594290e303107ee7c9134717da4cc5

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