Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270e5836bac340e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-01 17:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5e5416a6c2073c0925014adfecfb3b1 SHA-1: bc8120ca1db75a6cd7a9e2f4e419e283a0b9820f SHA-256: b270e5836bac340ea3e1ea59d3e118717d642e6c2bad744099c7c6429107c18e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which point to redirectors designed for phishing or malware distribution, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/123?utm_term=the+talented+tenth+dubois PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fde01faaf740.pdfIn PDF document text
    • http://kiratemize.22web.org/tokanixipigulufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fd88d221db99.pdfIn PDF document text
    • http://ripelavezomosiv.iblogger.org/8203475507.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/lizosarowobol.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/nodetuxapabara/sheetz_easton_pa_18045.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/bowflex_xtreme_2.pdfIn PDF document text
    • http://sapuxomaz.epizy.com/construction_worker_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/who_gmp_guidelines_trs_961.pdfIn PDF document text
    • http://luvojidepezepag.epizy.com/reading_pop_culture_2nd_edition_summary.pdfIn PDF document text
    • http://jikusipuxojapu.epizy.com/pukivudakotavevanad.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/papekaguwesinubamukir.pdfIn PDF document text
    • http://pidezesu.rf.gd/74849164895.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/electronic_fuel_injection_system_explained.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_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 4908 bytes
SHA-256: 0b22e8feb15394b3979284c123707785952ccced84fef0dc72627286d823cca2
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10692 bytes
SHA-256: b18b7b5f1c8acd8482ae2cf72c5d72eadbb6bb16c0b546b69f8e53082073c04c

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