Malicious PDF — malware analysis report

Static analysis result for SHA-256 b629dc60f32c17ec…

MALICIOUS

PDF

71.3 KB Created: 2021-02-27 11:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 97c9df1712e207765a14ce16c3c0cb28 SHA-1: e1a7ab2bf5c0eefa910c418545a1f44292c04f8c SHA-256: b629dc60f32c17ec776f69f472da8dd5b4baf2f4d54ab617b47b5f0104ba9d40
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=country+flame+wood+stove+parts PDF link annotation
    • https://cdn.sqhk.co/toliximozupa/iacZibO/viridian_coffee_lawton_ok_menu.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/vewiz.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/kutovutododikilok.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/71f99e1b.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/piwetipan.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/1799279.pdfIn PDF document text
    • http://peteferix.mypressonline.com/xuvodivirisozelologati.pdfIn PDF document text
    • https://zokokemakate.weebly.com/uploads/1/3/1/4/131454090/netax-vedukiwanika.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/60c0699b.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/9580837757.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/xibosabi_sukipi_basopir.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/9031047c642.pdfIn PDF document text
    • https://gezixipa.weebly.com/uploads/1/3/4/5/134503119/20cd5ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 5348 bytes
SHA-256: 508a917d46a0d3294a79eea810297628f3961d30d965314f01a786b2ae181d21
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 10496 bytes
SHA-256: ed4969e75b3dd403b20f3b085c46dc30458aa8464ec50a2fb01f323bfd9b5ed4

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