Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c2a3d2502a0073…

MALICIOUS

PDF

78.9 KB Created: 2021-02-16 21:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc7db711c5433a7cf32ef90b07c6f960 SHA-1: f2c3d4061002bb53f881953e38b93de5c4f86352 SHA-256: 36c2a3d2502a0073f58138398090420b9ae34fdc1ad2d71f2d8c52e615ab6cd2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=acer+xg270hu+review+reddit In PDF document text
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/fasawurojab.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/7444174.pdfIn PDF document text
    • http://vomeperegobo.22web.org/45228107455.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/bibefuximezapit.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/6806529.pdfIn PDF document text
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/6590796.pdfIn PDF document text
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/5873831.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/4391353.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
    • https://s3.amazonaws.com/zusevamasor/1_step_equations_worksheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/crappie_report_sardis_lake_ms.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bokopefof.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/54827089484.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/59630067576.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/sunozimorad.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/78742953086.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/cbre_cap_rate_report_q1_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/52271370481.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/15333347878.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/african_music_history.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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 5012 bytes
SHA-256: bb96f2c9eabe3f3e162319551d01d89fff42d797e5dc42b4583a9525cfdd4cbd
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 11100 bytes
SHA-256: 009ff334b4021ab1bfa6df6eefb99d4e20338a2b3f21e2d231eae55d9e05eb37
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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