Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a5d940e01f1cfc…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 10:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cffe9cd936ec2a776bf98c88cb8a0a7f SHA-1: 5def5532ef70cb26229f4cd204f90c2ea23bad06 SHA-256: 00a5d940e01f1cfc455564066fa207ba5dd1d135cfa3f2dd2b223d7e6180cf23
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a large number of external links to other PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=nick+saban+book+pdf
    • https://palepolute.weebly.com/uploads/1/3/5/9/135963306/vajuralobirefagere.pdf
    • https://cdn-cms.f-static.net/uploads/4387031/normal_603f18277f64c.pdf
    • https://cdn-cms.f-static.net/uploads/4379844/normal_604f70f7e65e9.pdf
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/6eef8e768c4d.pdf
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/vukisefox.pdf
    • http://naxajogilelog.medianewsonline.com/gutedoxuzometapigo.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/rafexunusuw-kixojuxupafa-lufawo.pdf
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/wufoveder.pdf
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff4c20da0fc2.pdf
    • https://cdn-cms.f-static.net/uploads/4480736/normal_6043e715c7252.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_604f58b27f880.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6031f2074ff11.pdf
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/pumexupajewes.pdf
    • https://static.s123-cdn-static.com/uploads/4380539/normal_6004dba9be2ba.pdf
    • https://xorimaki.weebly.com/uploads/1/3/0/7/130739578/jofiginegopiz.pdf
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5ffbcacc9784f.pdf
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/9a0751e6e760b.pdf
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/8160366.pdf
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/1213853.pdf
    • https://kofosobi.weebly.com/uploads/1/3/4/5/134528260/4207272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tirisesu.onlinewebshop.net/how_to_implement_agile_methodology_in_testing.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ec.bin
63e4f9422ce586031881af3549849d610dc2527dc8264f3829d95833dd85c574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5196 bytes
font_01_sfnt_off00011bb8.bin
29f4d3cd01f7acd2fe36378651bf73abb44bed2fac3e3adad2df3e7b4063632b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 11604 bytes

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