Malicious PDF — malware analysis report

Static analysis result for SHA-256 9426e8ac16f71503…

MALICIOUS

PDF

82.4 KB Created: 2021-02-17 08:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e49662f5a55397ac54d0d294d8042d0d SHA-1: cb127ef9b975cbf473dfdca6d2782ac6263146b3 SHA-256: 9426e8ac16f715035a03563ceb04dcef876cbba6fa101fa025357c1807623861
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure strongly suggest it's part of a campaign to redirect users to malicious sites.

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
  • 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://leonvi.ru/wix?keyword=lessons+of+history+will+durant+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6013bc72f0eb1.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/4999817.pdfIn PDF document text
    • http://getveran.site/14342159139962rd.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/xizip.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/qBtigcX/niwurijemibixodusukij.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/60bea68c6b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_601ef1f4c3e69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fcc53a01809c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_6017f80d6790d.pdfIn PDF document text
    • http://zdorovienashevse.xyz/simple_listing_example_sentencedpkps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_601b461a6bbbf.pdfIn PDF document text
    • http://wowmarket.info/real_chess_3d_how_to_castle573xv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_600935fd94e46.pdfIn PDF document text
    • http://zoomita.fun/alamofire_multipart_form_data_string95xvs.pdfIn PDF document text
    • http://carbackseat.site/mera_gana_baja_de_song_mingkzzjt.pdfIn PDF document text
    • http://ig-socialmedia.xyz/9730720675qrkwg.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hehcjfj/82075259205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ffd1f4ad43ef.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/hiNhjgd/tie_dye_kits_walmart_instructions.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_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 5264 bytes
SHA-256: 3aaeae6abfd78b4f33932d634548c860d17972281b73448090eedad69abb7ad4
font_01_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 10136 bytes
SHA-256: bbcfff4655c50a597170557a148d3d4efceb1862ed15719f778d223fd4bf1741

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