Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb65f11a961c0e9c…

MALICIOUS

PDF

77.7 KB Created: 2021-04-11 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6e2271e9560db0924162d367280e9a9e SHA-1: 4549537e44fd13c036ed39004617ce3dc8a1e07d SHA-256: bb65f11a961c0e9c8dd7dd4a568704d656cb8cdfb446d505e4fd4a362a8ef8c1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://mezovuduw.ru/strik?utm_term=why+is+direct+rule+important PDF link annotation
    • http://gakivako.iblogger.org/blue_stacks_new_version.pdfIn PDF document text
    • http://nowijito.22web.org/gopivoruk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5ff14fe382dd2.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/Vhjhhbi/t_mobile_plans_vs_verizon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_600062147e11f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fdabeac9c916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_6028fef97a8f7.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/jeChiNZ/lemikazijemilu.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/nXhepje/54125714952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_602e0fec25ade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5fcef86b8f875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_60519fc373843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_600a060789217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_605e062fb3ede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_6003df7e1e1c8.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/english_test_b1_b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_606e4b14b7f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_600e7b4acc1a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://givaradipokez.epizy.com/17957529644.pdfIn PDF document text
    • http://jenofabejuvokag.epizy.com/15374792155.pdfIn PDF document text
    • http://fasevirova.rf.gd/46406414618.pdfIn PDF document text
    • http://fapiruligifujo.epizy.com/lujidijiba.pdfIn PDF document text
    • http://vuxikujare.epizy.com/sum_of_subset_problem_using_backtracking.pdfIn PDF document text
    • http://guzaxugevogifu.epizy.com/95548371964.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5308 bytes
SHA-256: 67a906cda839631b9d611a9ffb60435534b4d8d3d1bfb7591d5acb0fcdef2564
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10772 bytes
SHA-256: 69a2b98faf24de3fe8131aa0ba58012c8295e550be129e1dc69dbce1d91b66c1
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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