Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7c72edaec46a2c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 19:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9150f90778d21724fa65652c933956f2 SHA-1: 1ec21daf7e04bb4b140b53aaa6eaaf7658446971 SHA-256: fb7c72edaec46a2c6f4512fda92e699214aa5936540911f1e360a80e588f2878
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into clicking these links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/strik?utm_term=pentair+intellichlor+ic20+replacement+cell PDF link annotation
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/1980760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_600c6282c046a.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/9547880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_60147455e6c23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fe32d9541f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_601243271bb9c.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/0600d71e436.pdfIn PDF document text
    • https://juroluse.weebly.com/uploads/1/3/1/0/131071309/9494708.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/fabac1a0.pdfIn PDF document text
    • http://lazadacostumercenter.com/shakespeare_sonnet_15bf8qt.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/kajaguzaxijib.pdfIn PDF document text
    • https://vevilatibivu.weebly.com/uploads/1/3/6/0/136082609/papedosafigowutubim.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/9310438.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/948727.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/vukavedadegeduva.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/sevafimukepu-ruramakar.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5268 bytes
SHA-256: a00462f44c7cf6d1d85517e01df797634d27831b0261ba844ea3e178ce45e290
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 12508 bytes
SHA-256: 2ac60fb8cb8293cb1da9d25549c12c2081bca4006536a387c684e5504ff78fe4

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