Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf438480aa827fce…

MALICIOUS

PDF

66.0 KB Created: 2020-12-17 00:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bc225f2daaa19d378459681bc322d47b SHA-1: d00985c78d9c00ab5effab178956efadb8c42ba9 SHA-256: bf438480aa827fce9d8d491fa149e3827bf9001bdfc459296b1a098d83c44928
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains. One of the primary links redirects to a known malicious infrastructure. The ML classifier and ClamAV heuristic firings strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=searsport+high+school+calendar In PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/b21790.pdfIn PDF document text
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/4b72f2b8a0a1.pdfIn PDF document text
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/5090550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd6ceb92d43f.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/gogikik.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/5028971.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/6694725.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/860710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5f9d058284c99.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/jesakelogofe.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/kiguteperilodu/acr_guidelines_gadolinium_gfr.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/xifom.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/antivirus_norton_free_software.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_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 5436 bytes
SHA-256: afdea76de13fd9024412c698f0fd946ebc90965197da364f4632eac3d7c67904
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 10016 bytes
SHA-256: 8b1378361ac63bd137a3025154f70e8814c82a16d343d4898b23860ce8816607

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