Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b1fc6ad1582ab9…

MALICIOUS

PDF

74.5 KB Created: 2021-01-23 00:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c4a2f07c4463463e543e501c0a77a8a5 SHA-1: 83d5dfdb541097ea0fb508a89a43250fc5de02db SHA-256: 26b1fc6ad1582ab944d34006d7b9ba42854ff2f560da8c11a05615a8512f4aec
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 other PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://seumenha.ru/aws?utm_term=blender+animation++for+android PDF link annotation
    • https://gabavogafev.weebly.com/uploads/1/3/4/0/134000006/fopepupetofon.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/jaxininapi-sitiwol.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/biravo-fajoxezutid.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/rifezakatem.pdfIn PDF document text
    • https://waragorejitise.weebly.com/uploads/1/3/0/8/130813548/defezini-vitawoxubazul-bepalurafodepa-ledolofup.pdfIn PDF document text
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/a99776626ebf364.pdfIn PDF document text
    • https://giminefimir.weebly.com/uploads/1/3/0/9/130969553/8974306.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/vevazifatim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_5fd237bd5ab19.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/gipajutovorozigon.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/jbBmjiG/72480789958.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/belenixediwago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ffa338eb74c3.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/goguxalipuneporoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/turakaxazawukudoxom.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/fipigukuwixuwixefozufa.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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 4924 bytes
SHA-256: a24b30431f8798daf25a25743345dfce45cd4c4e4da1c73760992b4174246f52
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 11068 bytes
SHA-256: 11d17188253633f86c0405a52f0152e6a501771ed383561d557f93138501578c

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