Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef9d082f30e2a4…

MALICIOUS

PDF

79.6 KB Created: 2021-02-28 22:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e34ee6002e4662bdec088386dde7b4b3 SHA-1: 46f8c1548a795fb7130a4daca6ec757dc585d7ca SHA-256: 24ef9d082f30e2a471b6bf101930f7e64ff29d058f21d53e5af9164c2a0a1293
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct instructions or lures are discernible. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://jacksth.ru/award?keyword=informed+politics+achievement+gw2+locations PDF link annotation
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/4742015.pdfIn PDF document text
    • https://bobitakakafaze.weebly.com/uploads/1/3/5/2/135297082/1264123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_60258c240c01c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6012bb23500f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fc7b5cb6cfea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6001c64b7e402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_602c82c28b5fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff2b0926e3a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_602374f6b0dc4.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/topebipixilupo.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/1981030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fca2de01e7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fda7fc52e54d.pdfIn PDF document text
    • http://gisaxisiburu.66ghz.com/varajizof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6014b04eb670c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_60331edb70595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe541c5ac468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/wilibakofosizosonifu.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/fefefaxewukanadixelegi.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/vertical_scalability_in_performance_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/82551879386.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_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5792 bytes
SHA-256: 61f93c92edb7e1842e900f5f25677be274298703e94b8206c4ecfdeb70fbdbb8
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10476 bytes
SHA-256: b8eb57011fcbaf39aed7f455bbc22a68447a8f75ab15fefd8e71ce40e974d4ce

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