Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a3f62dbf93f2bd…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfd22522f3e462edbd4bc0899768fce5 SHA-1: c5b9448a07a02da5c6352ff74c713c2f6d2807fa SHA-256: 88a3f62dbf93f2bdb508a79410cb942fa4e748378b1221b16afb4c712fa4f97a
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 pointing to various PDF documents hosted on disposable domains, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly indicate this malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/123?utm_term=tactics+for+listening+1+pdf PDF link annotation
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/togita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fd99a914e356.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/nuderoravijiraguxu.pdfIn PDF document text
    • https://dobuwejakunarek.weebly.com/uploads/1/3/4/7/134772316/5ffa4b8c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b92d09d0e.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/f2db6e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_603dde3f75ecc.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/2734341.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/bigehf8/95932076996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_60417df385c17.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/hgcWhhC/kesidufove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fd0976c6ce42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_6025f50690cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6032d860eeaad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5fe7468505927.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/wapogenopome-supunefanabeneb-virupuro-konomuru.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/9369449.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/gobipesakumujukuses.pdfIn PDF document text
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/3774b0db.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/caaeae.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/8SMvjOH/11085682007.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/eibDgf7/racing_fever_moto_hack_apk_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/diagnostic_interview_for_borderline_patients_dib_r.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/skyrim_mod_list_xbox_one_2020.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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 5324 bytes
SHA-256: 123b648fa9bd5bfef2856970b87302e773f6da840b3f0827278bdcce711159d0
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10756 bytes
SHA-256: 4ab0b44a35eeaf340c8ef622630f878d19061229a6f87949abc6cf7033260579