Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db3c5356f5bf489…

MALICIOUS

PDF

88.5 KB Created: 2021-02-27 06:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6591745f45bd1daab103b60fb329ba66 SHA-1: 50d187221ca67cb40aeae1f581df04ec3d539c0a SHA-256: 4db3c5356f5bf48904a3fa59f2441fb9f260792ddc079ddae8eb8840a8b49bfb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://botokaw.ru/strik?utm_term=fablehaven+book+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fc800062982d.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/gcAhj9D/kagujeranoxumaxazuzuniwas.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/ajfUgcD/larabejilaxigivip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fe272bb5c1a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/iejeyYI/country_life_harvest_day_fish_pond.pdfIn PDF document text
    • http://simkosa.website/81655649092r26t1.pdfIn PDF document text
    • https://manobafezelibo.weebly.com/uploads/1/3/1/6/131636879/885319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_602f340e9ad5c.pdfIn PDF document text
    • http://reactivaperu-2020.com/multiplication_worksheets_2nd_grade_arrayliu0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_603630b3bdb10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff072b0465dd.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/gcPGhdx/joxafagoji.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/bqggEja/wezowox.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/difoijP/pulezovus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b516ea32e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_602f99c7d8252.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://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_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 4428 bytes
SHA-256: a0387b0f67e0ff65174884c55130e9b91fbff6f9a5b317faed0f3cf86f4899b6
font_01_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 10948 bytes
SHA-256: e97d9eb8cde36621c8d3e07d74919c548bb6ada6b9fcd95075f4dd63a452b9fd
font_02_sfnt_off00014685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14685 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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