Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce3786e3c2c8a5b…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 05:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a031e05ebe78109d2e598c81a8fb9cfc SHA-1: 44cb053b1d2a6bff5b895ffb8e427e788f09f6cb SHA-256: 4ce3786e3c2c8a5ba8c83ec2e760fd0761ebb5a0a24057879c7feb935bfe7b8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, possibly exploiting the '2020 cyber school teachers make' keyword.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=2020+cyber+school+teachers+make
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fd6c8361d4a7.pdf
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/8525945.pdf
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5ffa5b84818f0.pdf
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/7364448.pdf
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/pazirixivoxinas-gasiniwujuj-vidavo.pdf
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ff5aa18d44c5.pdf
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5ff63615e43b6.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012df06da299.pdf
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5fca229c26ec1.pdf
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/gifowiw.pdf
    • https://fusofajo.weebly.com/uploads/1/3/1/4/131438110/7187111.pdf
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/kemufewovub-noniz-fobonigazub-galotiw.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5fd95a66828a0.pdf
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/kogegidafo.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6012daae6b965.pdf
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fdfa0eae3441.pdf
    • https://static.s123-cdn-static.com/uploads/4447450/normal_6003d13903f35.pdf
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5feda0abb0c7d.pdf
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/devejiwiveduferibus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/capital_structure_management.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_off0000d981.bin
5fb50e4b5e0916934b851d32999f2a3d6499613dc1bbb7f56590edcc288e4694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 5524 bytes
font_01_sfnt_off0000ec20.bin
a9c5c5367db2ae87ffd6f89b13e91a2bf359899156c9c54df4ebc619408ce1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10340 bytes

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