Malicious PDF — malware analysis report

Static analysis result for SHA-256 277fb8738d9e1246…

MALICIOUS

PDF

88.6 KB Created: 2020-12-29 19:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c121aa74ec8e99d2f36faaf5d0273f3c SHA-1: ef5d34fb8315a8ee367d5de4bd90f8f831247db8 SHA-256: 277fb8738d9e124693b7ab0c6b46a1ddcab7e5ea3d3f86e6f0f6cf8eae35db56
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=us+tip+report+2020+malaysia PDF link annotation
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/4362694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5fb7e31c94bd0.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/renarozuragizozu.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/lubixabumel_jofamuzew_fidotiladekuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fca66a91a136.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/Sgig3gd/74204156100.pdfIn PDF document text
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/6828719.pdfIn PDF document text
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/majekizosasunazisude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/21521285543.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_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 5332 bytes
SHA-256: 10b72a9f2c81e98f45ba886d41eaf43a86314996f1b8a0a5f7dbbb522b242a93
font_01_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 10704 bytes
SHA-256: 0fdf95880da49b8e170209f641639f07273da7621357aced6b003427d23fc1c3

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