Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88e0a38db7f40cb…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 21:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d61b20b78f053eeefa8637d3b4e5a857 SHA-1: b8203c1ee0619512786d6e3d0c1d71a5ed1a31d6 SHA-256: c88e0a38db7f40cb66ce0ef9e1a2ebec32678fc548354bdbfb3035107190fbee
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

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://druttle.ru/123?utm_term=wendy%2527s+menu+nutrition+small+frosty PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376610/normal_6007e09757227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5ffec3582dc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd2d8837cb9f.pdfIn PDF document text
    • https://tesazovefikuk.weebly.com/uploads/1/3/1/4/131408970/7680271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fd8898abf92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff216866a03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601e05beb43da.pdfIn PDF document text
    • http://soinjaga.ru/lagakibamisokasujvk4g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_601db5ff68710.pdfIn PDF document text
    • https://sanegirorasatu.weebly.com/uploads/1/3/5/4/135400744/9901815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_60271e3bc08e9.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/vevurukugimobi-woxanigapunadi-papazokan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494663/normal_5fe56cf63f0c7.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/67378735160vz9fn.pdfIn PDF document text
    • http://item-mask.top/chaco_golden_knee_care_guidekgqfb.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/duxofinof_pegamid_vesila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_602c13d92e1b8.pdfIn PDF document text
    • http://belkwigs.com/gutaverodudigojibibetumyikty.pdfIn PDF document text
    • http://naturapple.space/jivis9u2kt.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 5200 bytes
SHA-256: 7dc25448e315669ca86926fbc11929aab4457a447f94960c189678b38a2850a8
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10672 bytes
SHA-256: 704e4a521714282e2e0c06acbba4509f9a53bc2c9a6729b0c92fe43bae06e891

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