Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ffc30e25efa7d6…

MALICIOUS

PDF

60.5 KB Created: 2021-02-07 15:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa491aae62685120b6d33bab7d02b21d SHA-1: 9102da9a3e787d06139f65b8625999ba8f4c9875 SHA-256: 30ffc30e25efa7d6999e31e49b93d5e619cc855bb2e345e7011c959d42109c30
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, many pointing to disposable hosting, indicating a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crophysi.ru/wb?keyword=twin%20platform%20bed%20frame%20canada In PDF document text
    • https://cdn.sqhk.co/fadejiweruw/iaja2ja/video_search_for_youtube_free_music_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/2Wdidje/dropwizard_metrics_vs_micrometer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_5fd8d476e7d58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffd0c7fddbfe.pdfIn PDF document text
    • http://detonicro.website/zupaziltvbi5.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/hcgdhhT/mt_carmel_umc_springfield_mo.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/3949723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415944/normal_5fe2f631633f5.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/zetafokezego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6009db4d47bf8.pdfIn PDF document text
    • http://linogozajasupe.22web.org/xotinogedezonevakume.pdfIn PDF document text
    • https://cdn.sqhk.co/jebanufebejo/icificJ/pibivomitidipeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapinogure.epizy.com/the_caretaker_movie.pdfIn PDF document text
    • http://kizofenumuvuma.epizy.com/41955873793.pdfIn PDF document text
    • http://vivimaga.epizy.com/72551282281.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_off0000b623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 5304 bytes
SHA-256: 0943a132dc8340082dcb53c30e62bebe7f702adb90cb937993614c87c65998be
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 8612 bytes
SHA-256: 281ff5946c917f7b8033200c2ac791aec6d2faaa0cf8ceecc4d09e8a01505342

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