Malicious PDF — malware analysis report

Static analysis result for SHA-256 decad3f6f64b46cf…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 18:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bacb70741abdf6e351863423fb695255 SHA-1: cbd5c2b6583f09b936d7cbf1618cbf1cc6667bac SHA-256: decad3f6f64b46cf97080d3c4e4b71ae831c99f2e540bdb9d505dc4e2817cf5f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. Heuristics indicate this PDF is part of a link farm and is flagged by ML classifiers and ClamAV as malicious. No scripts were extracted, but the presence of external URIs suggests the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=worksheet+kingdom+plantae PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408485/normal_601fb049dfba1.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/1241615.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/ionic_bonds_worksheet_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fc70d1880be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_6037f61600e3a.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/d4c933.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/61488997171.pdfIn PDF document text
    • https://suretilan.weebly.com/uploads/1/3/0/7/130738944/5831177.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/3025095.pdfIn PDF document text
    • http://xopasiwaxenoj.iblogger.org/50381772660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5fd5f078d0ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6050753580960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_60282341a3d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_60484e92e97aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_60051216319eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_60036b2dac013.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/ed9e9f0a-c76b-4644-bf4a-6e0f879783cd/bidiwuxomopedugojojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bab8ca3-173e-48fb-ba82-8b9391bf42c5/ronawuladeladodubu.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/lupulonagifufogok.pdfIn PDF document text
    • http://zawofepak.epizy.com/19140890898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af70f69-a1cb-4561-8817-685e6fcbd7c0/how_to_program_a_ge_universal_remote_to_a_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e90e1b-5cbd-46b1-9ece-d2a2b75387cc/47486123982.pdfIn PDF document text
    • http://vigadibomo.rf.gd/93343238838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f9cd50-b111-4ab8-b32d-341a5518cde6/how_to_take_permit_test_online_california.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/california_disneyland_map.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5452 bytes
SHA-256: da41a01348b6fdb3302e13566d37b982c2d89122b510d1339e712977fce3e2c8
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10864 bytes
SHA-256: 3392ed521ab4495bf86151bd55fa932f5eab5ae69e20e269b5ca47f143a180c3