Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ead4c271b03b4ce…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 13:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b460766661643f9151f7d643882c7b1c SHA-1: 5ff868510059929ac917093a6cf36ca5bd30c1f6 SHA-256: 4ead4c271b03b4cee78c76ecfefd36f22ad83f16ca874c97f78c1c967faa9afc
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating it functions as a link farm. The presence of a URL with 'utm_term=sunbeam+microwave+reviews' suggests a potential lure for product review scams or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://maypoin.ru/strik?utm_term=sunbeam+microwave+reviews PDF link annotation
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/narevigakixeme.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/396173.pdfIn PDF document text
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/sovopekozaveji_fisusepaxusudo_ribejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_60325a36a53f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_60303290b30e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_6025674b6d066.pdfIn PDF document text
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/fuwogepitezajibala.pdfIn PDF document text
    • http://zafotebobivet.iblogger.org/html_login_template_w3schools.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/vesiw_nelewovedike_buxavovanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_6026f89920518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakiver.epizy.com/5582836487.pdfIn PDF document text
    • http://vokorugagamozi.rf.gd/wejuvurumosigelo.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/40611445472.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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 5308 bytes
SHA-256: ea7dae10d6dd54962e3327ee2e3fbd6471245ee86214c72644b1bdb58b43dc6d
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10512 bytes
SHA-256: 13cd8f630e63b9a7725b549ed1af009af4fd5e78d86e48e6a3131a7a7e0e2e4e

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