Malicious PDF — malware analysis report

Static analysis result for SHA-256 839a3d1c16f07adf…

MALICIOUS

PDF

65.9 KB Created: 2021-02-15 09:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67fca08380692a9c602d86e20d3e3157 SHA-1: 5128f4e652580bb769431448e796bd8e18b6f9b5 SHA-256: 839a3d1c16f07adfcf6cd440f1d152f714c7e72b7ad46bc983741cac01846934
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious or deceptive content. The presence of a 'download button' lure further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=cod+elite+apk PDF link annotation
    • http://idealicacolumbia.site/zodasumusebimopevefp1vyp.pdfIn PDF document text
    • http://shoop-fm.ru/42302191805f4t6x.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/idFheZ0/lego_mini_battleship_tutorial.pdfIn PDF document text
    • http://vasugixoba.22web.org/method_of_preparing_projected_balance_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/gfgc0jd/barbie_halloween_dress_up_games.pdfIn PDF document text
    • http://bestsaleshopin.xyz/novijewcuw8q.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/timed_fluency_passagesty2mk.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/gchhjc3/wize_eyes_eyewear_new_hyde_park_ny_11040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopuviboxew.rf.gd/cheating_quotes_in_tamil.pdfIn PDF document text
    • http://nokigabexotuk.rf.gd/free_html5_templates_for_websites.pdfIn PDF document text
    • http://bodamuma.rf.gd/powerpoint_2013_themes_free.pdfIn PDF document text
    • http://razogop.epizy.com/92437253012.pdfIn PDF document text
    • http://sedunewer.epizy.com/ruvewugulugufubadexobo.pdfIn PDF document text
    • http://rawodofomer.epizy.com/54534373378.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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 4648 bytes
SHA-256: 9b42d8e836a8230ca4c14879fb516ad7156f7a9da61a241549b5e17d3a745222
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10880 bytes
SHA-256: 50418169a69827c8383b193515476b40cab67480ea06abc008512c68bd506cb4

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