Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8500080d4e19a85…

MALICIOUS

PDF

73.2 KB Created: 2021-02-17 13:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: be990c7251b6b1f01c2e9b71d86626c2 SHA-1: cde946a2756ce1b65d3d200736df41856128e39d SHA-256: c8500080d4e19a858f4ac1645d793be8c9f44c48a8bc3dcf52b90bec02f09e87
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=la+fuerza+de+sheccid+pdf+resumen PDF link annotation
    • http://esportzmlevent.com/46681487117s7xv9.pdfIn PDF document text
    • http://togoxuruk.22web.org/jakopibakogepafunovevafi.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/4pvngeS/gulezamakipototewiv.pdfIn PDF document text
    • http://losmopaka.site/depois_de_auschwitz_mobiz6kbp.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/gd6idTW/62287715644.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/hdBWQjb/jelumonifafatuwewasoz.pdfIn PDF document text
    • http://yazansoft.com/ansible_and_extractwymg2.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/XjageMt/how_to_draw_anime_girl_hair_side_view.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/JigeEcB/wafinuxapaderowupetufidi.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/cT7bhiv/46114414354.pdfIn PDF document text
    • http://nout-sale.site/83117804484zi296.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/8f687.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/Msaheja/recorder_of_deeds_philadelphia_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutegabirena.epizy.com/bafg_antrag_formblatt_1_online_ausfllen.pdfIn PDF document text
    • http://tasokapivodi.epizy.com/tovak.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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5356 bytes
SHA-256: 19b8628c10567d6394080f40a11d257abddf239a28d06796f1056bc7281ba5a2
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10760 bytes
SHA-256: 19435afcaadf5e2ff202e44c6bca40940b8d85277c18e893950d38765745d431

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