Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b17348c8d5deb7…

MALICIOUS

PDF

69.1 KB Created: 2021-02-22 23:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d38cb7052a940e741fd3f1461081317a SHA-1: 441fce078b1508fb8c1c5cff53f4bf769b1e63af SHA-256: 30b17348c8d5deb735e19fd4e3fecba80176507d7ec030ac31ba53d4a903e9ea
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to redirect users. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/strik?utm_term=what+causes+a+lg+refrigerator+to+stop+cooling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462379/normal_601376fb1d814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381973/normal_5ffbb4a68f308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_601367bd4fa5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/24iTJie/line_segment_joining_two_points_on_a_circle.pdfIn PDF document text
    • http://makamar.tech/manual_crowd_pummeler_how_to_get_chargesrgsw1.pdfIn PDF document text
    • http://best-ital.fun/22817006815re4y5.pdfIn PDF document text
    • http://zvezdasevera.online/popudulin0dvo.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/iabKQjj/seven_deadly_sins_grand_cross_code_box.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/igjasyh/47692224821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_602d53272f2d4.pdfIn PDF document text
    • http://datingdate.site/84668425192qpldy.pdfIn PDF document text
    • http://domen3.club/microbiology_made_rediculously_simple6xfep.pdfIn PDF document text
    • http://lynciguest.com/nedulajuou4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6012dea25ee07.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/zh0njdz/radio_fm_stations_in_lagos.pdfIn PDF document text
    • http://kulinar2020.site/61730832098q1fgo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodunimuka.epizy.com/who_is_the_youngest_climate_activist_in_pakistan.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_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 5288 bytes
SHA-256: 31c5cbc4ae659621a348f94ee6f6a7bdedb5f0d76ebf3920a2d7490400bbaa87
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 9820 bytes
SHA-256: 7bdc364b6fe069e247212fffde583ab45c74bbc2b0317eb3bd8cbfaac2fddc43

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