Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd9c1cdcff6996…

MALICIOUS

PDF

78.9 KB Created: 2021-03-27 22:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a44ed630a7231dadc5d17c7be8b6d766 SHA-1: de1d8d1a86a30959a732348243e67e9547b29c04 SHA-256: 54fd9c1cdcff69964f4d3986bde9c92f63329571e81d59b8b2acab78f919f5ad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for redirector links and a medium finding for a link farm on disposable hosting. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a game, directing users to malicious URLs.

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://dafemum.ru/wix?keyword=ragnarok+m+eternal+love+paladin+rune+guide In PDF document text
    • http://lasns.fun/35243745vdmgu.pdfIn PDF document text
    • http://reawolt.online/zawifelusumi4hde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_60168763af532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff9d692e99ed.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/emKjija/cbse_class_8_syllabus_2020-_21_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5ff15d8964a75.pdfIn PDF document text
    • http://50offstore.pro/ikea_catalogue_2018_uae7yvd4.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/huPfhVP/how_to_draw_evie_from_descendants_2.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/Yhehcig/29050834855.pdfIn PDF document text
    • http://megatorg.ru/xirabilujutunazevzrrz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_605d3eb439693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4aff34-03a9-4089-9ed1-8b2bf7c7c1b7/73736804494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9221c23-0d19-4d07-b393-2931890d7b8a/titopof.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/76994515626.pdfIn PDF document text
    • http://minapisifiret.rf.gd/is_a_harley_rake_worth_it.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/rasatabenusapozo.pdfIn PDF document text
    • http://mutodilevo.epizy.com/serikepiviv.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/4615627021.pdfIn PDF document text
    • http://gajitigigezujan.epizy.com/81038002923.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_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 5232 bytes
SHA-256: dd73ee99c8fb5f264f3db102ac5e4c5ce43c045db01a6727fa16a43a81bd1944
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 11488 bytes
SHA-256: 1e68a508f3e5d9ae1920583f2e7e4bc1d60950fb02154c2b1b9f150f272dfba6

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