Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2aec5e61b29898a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 14:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 124c673f884de1f8e9fb23c2842548b2 SHA-1: 4962ea0b6909e1b2d94fc813361e96b82c05c915 SHA-256: d2aec5e61b29898a9e084a89e6151884cd6df4f43da24fc3dac8819ccafa2689
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=les+proph%25C3%25A9ties+de+nostradamus+pdf+gratuit, which is likely used to redirect users to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=les+proph%25C3%25A9ties+de+nostradamus+pdf+gratuit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60e9339d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_605be04cd1584.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/xaxifusunikifawixukuxada.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/ashrae_standard_90._1_free.pdfIn PDF document text
    • https://jogivugu.weebly.com/uploads/1/3/2/7/132740949/kapolejab_bakasavozatazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5fd73fb852a7d.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/gakilubavomal_mulas.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/zodusobatim.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/8356939.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/4280976.pdfIn PDF document text
    • https://nurufumetexode.weebly.com/uploads/1/3/5/3/135323779/nukojiroduzaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_0aa3a4ba6849488e9843d92e9dd0cb6f.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_543ed84388304d98942c39f76e427719.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fb630a86744347629e2ba1937cfb0cd1.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_36546640ca6540bcba6de117f4f79d91.pdf?index=trueIn PDF document text
    • http://gogujigasad.onlinewebshop.net/93240887969.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/fairy_tail_anime_seasons_in_english.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_40a63ec7a84943e88e8d15076119ea05.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_4cc3920a81234f68978238695a3488b0.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_98d1b8ef758342d3a607094f5a916801.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_7cb019d069984b348a8796288364b635.pdf?index=trueIn 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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 5508 bytes
SHA-256: b49fcc164e209e59d7867a5083f82314c678e52a7186e4fcc4e84b825421a66f
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 13152 bytes
SHA-256: 2f36c1016e1e03d7edb71a45be91a5afd7c11ec6993731fc5b19d3990f375b97