Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bce8ffc3d8e6528…

MALICIOUS

PDF

72.7 KB Created: 2021-02-19 14:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5ad2480d510e816325e2acb7c4e0a629 SHA-1: dfd4676fe30a336d4ec3eced8dc5bbbc75b73caf SHA-256: 0bce8ffc3d8e6528508dd5f26ac0e805f10374d27139e75301e516ea1ab2741b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a significant number pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/123?utm_term=do+wii+u+virtual+console+games+work+on+switch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414360/normal_601d29b565e03.pdfIn PDF document text
    • http://feedbacrnz.space/kobomusurevepabofixc9m4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fdbd4ae2047d.pdfIn PDF document text
    • http://copyright-infringement.business/50244528445r0akd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5fc9797184911.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/cambridge_pet_writing_part_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5fe128822b41f.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/piriform_ccleaner_for_android_tablet.pdfIn PDF document text
    • http://myyshooop224.site/92132221903j2u66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6027591cea54a.pdfIn PDF document text
    • http://markettop.pro/kadunigqca24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifusejikudit.rf.gd/34383449303.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/welupupowigubabozifik.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/zivijigavuwufokalumin.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/juniper_ex2200_switch_datasheet.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/xijajuduwikol.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5428 bytes
SHA-256: db05acc004e96e13a30918c59fee3c5cb86ebf8ab881a1a363771d72b58c99ad
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10480 bytes
SHA-256: e3b660160b284ecf7dcf2285f8cd7490acc3264ab2584235b16b9fb2a67cdc7d

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