Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8b4509066fd308…

MALICIOUS

PDF

76.6 KB Created: 2021-03-02 05:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb482434b079dc65762a6b9f77b0ed73 SHA-1: 1d88d39903453ff7f1a7e7ee83a0c25c470aa0f9 SHA-256: 3c8b4509066fd308f1b35a148249373b789627ed528100b651592634b50d0377
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains and linked via Weebly and other free hosting services, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to drive traffic to external resources.

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://gimoguvi.ru/wix?keyword=compare+and+contrast+mitosis+and+cytokinesis PDF link annotation
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/vefenakopag-dewubesukagim-rogobopisi.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/vikurogoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_601880754c769.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/7564902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc986a1d8c60.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/apresentao_powerpoint_tecnologia_da_informao.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60102c048433f.pdfIn PDF document text
    • http://gufutaca6.xyz/70485773341shm1p.pdfIn PDF document text
    • http://jezesotuvi.22web.org/how_to_handle_teenage_anxiety.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_600e01717c23c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fcbc35557f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63916cea14.pdfIn PDF document text
    • http://kataval.22web.org/what_is_universal_affirmative_proposition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_6023575bd3b46.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/jhPbe3B/44459081507.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_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 5260 bytes
SHA-256: bb91d9e91928f41ed219ade59aceefff05d87a33ac890b5cd921f37d22a3ee28
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 11192 bytes
SHA-256: eebb1da14f89badf835f2fe5074cf0bc478a3754531003d3b9643c31a1fe8861

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