Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c207b3d3a533156…

MALICIOUS

PDF

74.5 KB Created: 2021-01-29 13:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a76593bd37cf81b6f127da6b991e1107 SHA-1: d8bdf2e7724794816e172b03e6e6596568a1a93c SHA-256: 6c207b3d3a533156f0a64eb5c4e456f10ac486b8a51af3b9d5c5b54b1fac232b
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://cctraff.ru/wb?keyword=duke%20university%20basketball%20arena%20seating%20capacity', suggest a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate it's designed to redirect users to potentially harmful sites.

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
  • 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/wb?keyword=duke%20university%20basketball%20arena%20seating%20capacity In PDF document text
    • https://cdn.sqhk.co/podidiwi/jj3xMXN/minecraft_1._7_10_mod_slenderman.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/ghfhchi/umc_pharmacy_lubbock_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/BA0ghia/transference_in_therapy_youtube.pdfIn PDF document text
    • http://funogager.22web.org/instant_notes_in_ecology.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/hhgfGgi/kuzukevim.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/batman_bad_blood_2016.pdfIn PDF document text
    • http://gatorama.fun/18833603233o46w1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizulubafaxal.epizy.com/classical_and_neoclassical_theory_of_management.pdfIn PDF document text
    • http://safasufozoz.rf.gd/wavelopubumo.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/mibekaranum.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/level_11_94_percent_answers.pdfIn PDF document text
    • http://dimafox.epizy.com/sql_server_2016_virtual_machine_performance.pdfIn PDF document text
    • http://sofidusujewa.epizy.com/15415943218.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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 5464 bytes
SHA-256: 96799b29cc683adf3eb63a35f6d8d103a3a227daa99349db04f3a3c12b43d4a3
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 11088 bytes
SHA-256: 992b35711c0e58414776eb45c88f562e42212f7d8da89aafb9f8462175dd2316

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