Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef95fe1d2fcbd5a4…

MALICIOUS

PDF

81.7 KB Created: 2021-02-15 20:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ae468e515f8ba429e82fc93a896fe532 SHA-1: 7e3bc8b508aa05e9cc201b24d817b904736e1add SHA-256: ef95fe1d2fcbd5a49466df45daa8288f16b5b89a4297eea6c7d27ff3a3f433ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious 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://leonvi.ru/123?utm_term=7+steps+software+development+life+cycle PDF link annotation
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/morod.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/kekirufado.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/784ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fc94e85e03b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5fc9bf43a7cb8.pdfIn PDF document text
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/c2fb98e04.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/fiduxaze.pdfIn PDF document text
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/ketudovotasubazub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_602362e88d163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498392/normal_6009457692e68.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/dasazivotigaritajawo.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/mugewaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6025f7940e643.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/0ba44212.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_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 5540 bytes
SHA-256: 04b10334a51de13bb56b89c01e81b393af89a586bdffe561a1c533bd032abd0f
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 10740 bytes
SHA-256: 43ab849a165b16062c8880388643082e7e66effff53493d905c312981de46bc5

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