Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64e7f77a7608192…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 16:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1cf55e0853821934301538728b22a837 SHA-1: 23fcdf55962f662ebcfbe48b9912d69e41c81d8c SHA-256: a64e7f77a7608192a8320e5b8f4f510aa2611f5792d90ce9c085d462bddcc2fb
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable domains or file-sharing services, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure for academic search results, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/wix?keyword=6.1+rsg+answers+math+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5ffa0c4d4c498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5ff083d633dcd.pdfIn PDF document text
    • http://namedaun.fun/ardaas_karan_movie_mp4_hdiev06.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/05cfa487bddf.pdfIn PDF document text
    • http://kpovli.ru/korazinol3bk20.pdfIn PDF document text
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/tajaja-dapiw-watukoza.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/data_structures_and_algorithm_analysis_in_java_3rd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/rHhhYjd/69771956683.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fe286b364131.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/303_squadron_battle_of_britain_free_download.pdfIn PDF document text
    • http://adanakebap.org/solitaire_freecell_for_pcza3tn.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jczaU8d/62623058112.pdfIn PDF document text
    • http://freefire-gifts.com/taptap_app_review4ry1v.pdfIn PDF document text
    • http://ita-bio.fun/how_to_install_pegasus_shower_cartridgeyynor.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/ggihjaY/crossing_jordan_season_6_episode_10_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_600a9e8810f03.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/gdEifOr/z_nation_season_2_episode_6_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 2904 bytes
SHA-256: fa763f70197920411bf5d976148774d4937486adf65d2d77120ccdc0f707a74b
font_01_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5436 bytes
SHA-256: d4c8c0ea3bbb2ec2fc78e4c0e4c505be6d4b9237fb52ba0ab9f3b555e5016504
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 15312 bytes
SHA-256: e3b2bde5e4ae808ab1f89a6c4b6ca83cb06405cc952804c1d4ea95ecc2e4748b

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