Malicious PDF — malware analysis report

Static analysis result for SHA-256 4857dbe0555ff855…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 05:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f08f7094f92261e3be7e46c52e20ed2 SHA-1: b63a5460ffa803847720d5101c1f15a57b04411b SHA-256: 4857dbe0555ff855fa035437aa47098ad7f84aefa15ded62affd679883ccbec1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=grendel+online+book+pdf PDF link annotation
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/827524.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/9368396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_6011ed3c2b5a8.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/sefizoriparemagos.pdfIn PDF document text
    • http://bnl-jobs.com/ccna_2_chapter_1_answers_2018h26oc.pdfIn PDF document text
    • http://meetsucre.pro/ruziduridepukexujunny2or.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/8414480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_60090801cce74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fe5cf7947438.pdfIn PDF document text
    • http://presalle.xyz/protocol_g_series_helicopter_chargerd8w9l.pdfIn PDF document text
    • http://podarokinsta365.site/5660577228c9agd.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/h2ieWhj/desukamegezatemuduwav.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/iihfQjc/capstone_meaning_in_education.pdfIn PDF document text
    • http://stalekost.site/pukipopxpbny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcd4447cd985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulofuza.epizy.com/checkstyle_generate_html_report.pdfIn PDF document text
    • http://zowiseli.epizy.com/53866999622.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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 4880 bytes
SHA-256: 8f68395ff09dec8c4420bb31f20bb30c5e76303c1a6ea2beb1d09622c0dfff42
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10568 bytes
SHA-256: 0a3b4a5eebd8608f8d3de9ad284eaa619862e66377cfceb88d646f13413bdee5

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