Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f70f806a187afdd…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 20:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5528e21dccdde5d828f8573fe70018fb SHA-1: be2cd13c17d1b70c29143dff0b66e97a8c6d034a SHA-256: 5f70f806a187afdd2916928c331aa728490a2680be9c924f4c942adf99a4623b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/strik?utm_term=how+to+make+a+weekly+schedule+on+excel PDF link annotation
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/1519261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_5fb927c322ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fd1e116e20ad.pdfIn PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/vuxupibofosivag-filofogagi.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/laziri_fosepuvowexa.pdfIn PDF document text
    • https://somisesi.weebly.com/uploads/1/3/4/5/134523690/928169bd35c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f93566a8d5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fb427503fa9d.pdfIn PDF document text
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/7805168dc52f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5409b40f1034a5cc57798/t/5fcd0de91e1a4d7de12f5db0/1607273961572/dragon_quest_11_xbox_one.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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 5368 bytes
SHA-256: a641045ec9fd44b75dbb02daa68d340a51a9f0595b7e9bf11efb8e738358543b
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10300 bytes
SHA-256: 5ddadb2f2ae7bdf26e821f95eb072fdd6c4913ce358d4cc897ddfeed5acc3c62

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