Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e25219e36f50b9b…

MALICIOUS

PDF

76.6 KB Created: 2021-04-13 15:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bedf61644a021117b788f6920986d6d7 SHA-1: 22345d9ad9c657de197052cf855880cdb97bcb4c SHA-256: 2e25219e36f50b9b3d23271bce64a7c98cc2536e82b71739104e6fca32b251e4
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=how+much+essick+air+humidifier+bacteriostatic+treatment PDF link annotation
    • http://complect-tech.ru/smtp_server_gmail1czly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_6050f12dab92c.pdfIn PDF document text
    • http://beritox.medianewsonline.com/32170160074.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/ditepusulamagan.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/ariens_sno_tek_24_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fd1c31d90108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_606974b14cdb8.pdfIn PDF document text
    • http://bottlechainworld.com/london_buses_information3h3xd.pdfIn PDF document text
    • http://demask.space/70175358157kkhgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5fe1c3aacbc17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c4203163bfe34873b3831b8986722474.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_193dbb736d0048a981390147dff760b8.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_400cd9ae57324154b48b16814922a674.pdf?index=trueIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_61878dabc19943c3b4f35302bf082d17.pdf?index=trueIn PDF document text
    • https://183cab0c-2e2b-44e6-b55a-0f82cb58e578.filesusr.com/ugd/133137_ddef847fae034f709206d280f9429186.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_4e1a71d7011641728c44a98394d4afaa.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_4a77d3a608cd4674ba6879375f09da0a.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2d613221940b46779240b7c681cf9c3a.pdf?index=trueIn PDF document text
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_05371097087f41e3a4936fb51839b9b2.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_cf34b4f9fc37423a8f3c18540cc1bb48.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_b0cc8ed679e04bd080949430d1165623.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_c8917a941fc042aa8588b5ca674113de.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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5484 bytes
SHA-256: b1b0a726c7dd8fd3c843470b8416b47746d34dff0c63462d5d5158814a890a7a
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 11224 bytes
SHA-256: 048f99048a8b4f6e5f6ac2865c7bd73703259a365f995038d3c0b7f8a7ef1b91

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