Malicious PDF — malware analysis report

Static analysis result for SHA-256 0832901046b0431c…

MALICIOUS

PDF

34.5 KB Created: 2020-07-08 11:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d12a4f0266483a715acfacd192d14641 SHA-1: 5031eb08130f9a3e06b8a66a1b02dee9de2f511d SHA-256: 0832901046b0431cda8b917686af54a7e241c066e0b453797bd135720382a749
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely as a dropper for further payloads. The presence of a redirector URL further supports the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-8916112-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8916112-0
  • 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://ttraff.ru/wb?keyword=worksheet%20inscribed%20angles%20and%20arcs%20day%202%20notes%20geometry In PDF document text
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdfIn PDF document text
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdfIn PDF document text
    • http://files.dawnlsievers.com/uploads/1/3/1/4/131407823/vefegegaju.pdfIn PDF document text
    • http://files.dinglibiofuel.com/uploads/1/3/1/4/131482892/2522623.pdfIn PDF document text
    • http://files.editor-ghostwriter.com/uploads/1/3/1/4/131437753/riluti.pdfIn PDF document text
    • http://files.lorraineparishwriter.com/uploads/1/3/0/8/130873870/lobojixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zogivuse.files.wordpress.com/2020/06/75622904306.pdfIn PDF document text
    • https://zonutubuw.files.wordpress.com/2020/06/jonaxef.pdfIn PDF document text
    • https://fonagera.files.wordpress.com/2020/06/vavut.pdfIn PDF document text
    • https://pumixuwolil.files.wordpress.com/2020/06/bebodosodigosubasiwogeno.pdfIn PDF document text
    • https://kikivolepo.files.wordpress.com/2020/07/vakivodubogi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B35 5592 bytes
SHA-256: 14dd72c3a11eb96dd5ea2422ed16e12991a4c1e0560ddc802159a0496da7f7fa
font_01_sfnt_off00005e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 9084 bytes
SHA-256: 2765255808360f49814417d18df326b361b707941ed42033737b86528c940076

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