Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d950dc3508fc78…

MALICIOUS

PDF

76.9 KB Created: 2021-02-22 13:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10b6bed1829513b5cbb9a6ee665e39be SHA-1: d1c6bb92578b5e344208c52440a5feee5a127131 SHA-256: c6d950dc3508fc78c35de6668a79c26efe7cc6ba190124b6c24743a3ea0f473f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata related to web scraping tools, further indicating a non-legitimate purpose.

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://baarspo.ru/wb?keyword=best%20sat%20prep%20courses%20nj PDF link annotation
    • http://hargotel.xyz/nutcracker_piano_sheet_music_easyfc3il.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/iirjdwy/28930585638.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/7203645.pdfIn PDF document text
    • http://livopazumifena.iblogger.org/66578936289.pdfIn PDF document text
    • http://tophomework.space/missing_411_bookd26ow.pdfIn PDF document text
    • http://tipepusevuw.iblogger.org/executive_chef_job_description_template.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/6566022567.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/RhjXggh/wenukirurodevetexaregexi.pdfIn PDF document text
    • http://rutefozur.22web.org/51084938561.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/bodies_in_motion_and_at_rest.pdfIn PDF document text
    • http://starkrobotics.org/xbox_games_on_pc_freek6o4p.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/jKgdhiB/european_war_timeline_ww2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fereralud.epizy.com/20665741953.pdfIn PDF document text
    • http://fufebelanamug.rf.gd/56417650218.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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 5020 bytes
SHA-256: d25463102d21cd68e8573daa6b720d2563313120691b6084293c9e33c7e07d8a
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 11104 bytes
SHA-256: bad88fe2638f3acf8e0de8954d8fd94f8d8d22a775fa3b97edfb11e64fbd9363

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