Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a6cf7e55e87c23…

MALICIOUS

PDF

65.1 KB Created: 2020-11-13 08:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c598774d81b71214f55f914a60b07685 SHA-1: d80570ec2602623b546607096fdb589e6b5b6319 SHA-256: 52a6cf7e55e87c2346f7ca30ee82598e2df4d00b528f18a80d09805943d5cd60
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm designed to obscure malicious destinations. The heuristic firings confirm the presence of malicious redirector links and a link farm, with one URL specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=where+to+find+rare+flowers+in+ark In PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/fajamokage-tuzebipid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f95457cb08b5.pdfIn PDF document text
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/7cd3e8b807256.pdfIn PDF document text
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/6484698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f8cc0950b61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5f95f6503702c.pdfIn PDF document text
    • https://madimikelijexev.weebly.com/uploads/1/3/4/7/134717844/xutafu_vafeni_sevadasago.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/devuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fad61d2b6bca.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/gosifigodasawi-dizowuxu-dazorodeviv-bulapivuzuwile.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/c7b30f30-863f-4900-a30c-48e02e0b76be/out_of_the_abyss_download_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6e5405-a4a9-43cb-ac6e-4e6da7d3c683/sony_vaio_pcg-8112l_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b76a7ed-93af-4664-98f0-96c8190189e9/letter_of_complaint_useful_phrases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761612d3-c573-44ef-a9a6-25f77dd2e21e/39388193294.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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 5164 bytes
SHA-256: e610ba0fe48e18563dfd78c73ee110fcfe00abca80b6b2c5780785d0a4bf0fae
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10240 bytes
SHA-256: f6af9a3152af3290aab180f39755bdcb7627307db10a0ececc8c386544852831

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