Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfef63d0226e1764…

MALICIOUS

PDF

71.9 KB Created: 2021-01-10 07:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 15eea09e89fac045b3232d5de933ece3 SHA-1: 75a146e1fff7f5ca9828e5594764152bd67925eb SHA-256: bfef63d0226e17644f416fb51ce2671fed6088bbf388eafd732120c60337bd3c
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://cctraff.ru/123?utm_term=bi+3%252B+electron+configuration In PDF document text
    • https://site-1177610.mozfiles.com/files/1177610/suvalupub.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/3gjifzo/rogue_buddies_2_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/2shhggj/zawanexomufataxalurufexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fe394a524b71.pdfIn PDF document text
    • https://site-1172631.mozfiles.com/files/1172631/battle_royale_fps_shooter_download_uptodown.pdfIn PDF document text
    • https://site-1175307.mozfiles.com/files/1175307/blue_heeler_pitbull_mix_for_sale_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8917d35eb1d.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/89442888313.pdfIn PDF document text
    • https://garijonomiwobe.weebly.com/uploads/1/3/4/7/134711127/kuzudezesud.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/bally_s_executive_king_suite.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/10173966317.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/kavugusepe/template_website_bootstrap_slider.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 5084 bytes
SHA-256: 5ae9762d74790529c4e590d37058c103dabc9174b98e3f11bf70fb97fa20bbcb
font_02_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 11056 bytes
SHA-256: 375611ed8ff2552af80a4fad56fc96d3800a2ee952beb54233dfbde7c3bb4b3e

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