Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd96cdc829b20d01…

MALICIOUS

PDF

80.2 KB Created: 2021-05-09 03:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 902ba1752e86bdf27dc05ce821e6114a SHA-1: 4bf170e14ef57c705f9b5a24c89ce697265ba6e5 SHA-256: dd96cdc829b20d01934ac26e406af0c4714d42d89f7dc3fd088cd1cd2c5f4b09
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=does+dish+tv+offer+senior+discounts
    • https://cdn.sqhk.co/tezabulaw/aigjfjc/perfect_flow_ironing_board_cover.pdf
    • https://cdn.sqhk.co/gesafafo/jeCieUl/kofikevofabalobe.pdf
    • http://belplitka.ru/86624362802yo7qt.pdf
    • http://nepoxiduvilej.scienceontheweb.net/lodigi.pdf
    • https://cdn.sqhk.co/kerutadit/3vjiJyF/police_scanner_fire_and_police_radios.pdf
    • http://vovality.club/2004_lamborghini_gallardo_0-604w5b9.pdf
    • https://cdn.sqhk.co/mojafefegamo/ifoqZij/24219198115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_05e87da477b84741bf1c3c6c835643cb.pdf?index=true
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_2fc70ee5dd4b43eeafee5f3526e09d41.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_f9fe31a1bcb84fdeb05f40a3ec4ed671.pdf?index=true
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_60c4f8d04a6f462c84d07e765ca53e8b.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_686ecaa5d0fa4e9385bf4e2c02e3eaf9.pdf?index=true
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_256047dc63bb43f49a1f49a4e68ffbd4.pdf?index=true
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_ab4c89cde4854ce58e21fcfdda66f412.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_1a2f00e5fee04ba7b80184dee0121715.pdf?index=true
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_17042b149e834ab0abce20f1df12de62.pdf?index=true
    • http://pikubub.onlinewebshop.net/deneraropiregiw.pdf
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_7af047bb8dad498d85645c29403753e7.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_731dce6383a24499a10c805aa2871886.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin
a2e461f23591a6d6304663327767bf39989d212c96d25970926e5e9ca07eeaf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 4924 bytes
font_01_sfnt_off00010a5d.bin
9142836e8446020bf5931cb4ef9e2c7a5b054c7ff25b9e3995879433528a8d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11680 bytes

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