Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c63bab39861c6a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 05:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c2ffb6b4f514660e387ff6b9d37dc8f7 SHA-1: e266f9cf1bb39025498b0045d94e348ed157c71e SHA-256: 28c63bab39861c6ac9058e50647711a53140704e50287776fa4dd8eb404235b9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=a+guide+to+econometrics PDF link annotation
    • http://xokesate.22web.org/62964199151.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/jaxadekevobumu-fitobite-levonoju.pdfIn PDF document text
    • http://sanadewa.iblogger.org/styrene_acrylic_copolymer_emulsion.pdfIn PDF document text
    • http://podcard2020.site/68946405982dbz3b.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/lavujamutaso5hq0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedotedifajo.epizy.com/98056674864.pdfIn PDF document text
    • http://lemujiv.epizy.com/english_to_filipino_translator_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/sogogagixetupowizojiva.pdfIn PDF document text
    • http://bomumude.epizy.com/9633791779.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/xopinesotopa.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/83224526344.pdfIn PDF document text
    • http://sulumasofip.epizy.com/42925393522.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/yahoo_messenger_free_old_version.pdfIn PDF document text
    • http://runoxujozu.rf.gd/mejimigufijeta.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/60791070956.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/74905186165.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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 5008 bytes
SHA-256: 6d3a24867bb1311138046d3003d788f26c6411c4f80a42b35cefa8855c6db47d
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10464 bytes
SHA-256: 27851c72230c97247baa8176fdb18beb1d46faf0c1c95d979d3c9cea1610899c

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