Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42354f69012f03b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d18db8f3a3929e933674efc347b1405a SHA-1: 805e600ba4788dc5b6c9795607632f1262bb610e SHA-256: b42354f69012f03b03f5aa5fa9f8424eb5d404a2c309a23d30c29f262a2a2840
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external links pointing to other PDFs, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic identifying a significant number of external links. The embedded URLs suggest a phishing or malware distribution attempt, potentially leading to the download of unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=flight+radar+pro+apk+latest PDF link annotation
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/1782318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_603882f240b27.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/mexujomup-nepuxafobadif-venesuvizopox.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/1851257.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/deferixekozo-zadajitafu.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/6152747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_603b427b5cf23.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/razado_suginobeg_piverexusodim.pdfIn PDF document text
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/terokademowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6061d3b93e6fd.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/sigawo-tofetupijuwe-zemiga-diduwazasatupol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_6050430d76f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5fdadfb74dcd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485809/normal_5fdd16999dcc4.pdfIn PDF document text
    • https://dukagalirizaz.weebly.com/uploads/1/3/1/8/131856141/tajanur.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/kasebujowomafoka.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/982468a4345d.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/toxenitavug_gutexojutebuxa.pdfIn PDF document text
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/5462727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd17279dcbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_606b52aeedc6d.pdfIn PDF document text
    • https://sedixiru.weebly.com/uploads/1/3/0/7/130740143/kenukodedubito.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/504090e41021ab2.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 5240 bytes
SHA-256: ade001f92c0c714c077b544d152ae46e37387310db830a59016d5c7a15a58a22
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11336 bytes
SHA-256: 17b9c029b7bd9b7b9c87b4e5028d15edd4bcf86e650b7c929c52f300ec7c98d3