Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a81ec4618b3dc2d…

MALICIOUS

PDF

77.0 KB Created: 2020-11-17 06:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4165e0d4b28d46027c20759057429d0a SHA-1: 7a267c4eaf020227be9ae7cb0f75bb04feb63cdb SHA-256: 2a81ec4618b3dc2dcd28064be6092736635ad7206ae9df4bfe46d4aa73a245bb
244 Risk Score

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 and redirector infrastructure, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/strik?utm_term=clin+sims+rrt In PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/nesoji_zazivelejuzu_pagogoruwalo_kifuloda.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/nupurapitupibu.pdfIn PDF document text
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/bapirelo.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/zabez.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/66af46b9913d.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/nekuxi_gapem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5f93bd00317d5.pdfIn PDF document text
    • https://gusilurilusod.weebly.com/uploads/1/3/4/4/134480619/posisixirodumi.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/15416aba-4577-4b62-b5e4-a394d836f3bf/guvogasosofovinupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fc431b-f52d-4347-af2d-91c67e63e676/best_ferrups_fe_series_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9975180d-e771-4fc6-b83f-98909517dc08/modern_chemistry_chapter_19_review_answers.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_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 4524 bytes
SHA-256: 2937c365b04663f6c21adfece865ab07c919f5ecbfe922d1b80dfd4661f19455
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10480 bytes
SHA-256: 568f0640e526c4a78c4728653bd6abad43cb90ad0220c50e6929411d32c11963

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