Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edb86ab979d1324…

MALICIOUS

PDF

68.7 KB Created: 2021-02-22 11:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 95beb6ce7f495c02f15c08b9b52e2028 SHA-1: 7633875bc869449499f540fb78b086995eb5e072 SHA-256: 2edb86ab979d1324e69a0ef2d1e7cea18d3a9bd9dd6c1096f36b20cabe624dfe
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful content or phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=all+you+need+is+kill+film+tom+cruise In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_602cb2cc03063.pdfIn PDF document text
    • https://gagebopa.weebly.com/uploads/1/3/6/0/136051288/gexojel.pdfIn PDF document text
    • http://limevekobo.iblogger.org/android_arrayadapter_getview_position.pdfIn PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/nusubagapem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fd3136ea1b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_6019ca6290215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexomuradalo.rf.gd/gapubuvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/classic_wow_enhancement_shaman_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/53449141253.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/57411481243.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/the_interlopers_plot_diagram_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/kulfi_kumar_bajewala_betiya_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/82902050939.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/94529701571.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/jimelovutibapovev.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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5112 bytes
SHA-256: 73d865c5fa825beb1f73a2d9112ba19c08a4178726206ddbd74eb72b42fccb24
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 10628 bytes
SHA-256: daa10848c2e7952e8bd42acfedf0c6094bcd742a810b41f693e0041d4bc583bb

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