Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e603a5eef20db7…

MALICIOUS

PDF

77.4 KB Created: 2021-02-25 21:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 89e968b220784b41390173e96bf04254 SHA-1: ea66c5d2679556656bbcf57783d1d72557556f1d SHA-256: a9e603a5eef20db77d8ea7808c2e949b3458dc73991e7cea568f1de3d1d72045
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to redirect users to harmful 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://yafferge.ru/123?utm_term=ilo+tv+brand In PDF document text
    • http://alexsaf.ru/31875237808v5tei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_6025c0b946f1a.pdfIn PDF document text
    • http://doweryklkq.space/gefifajenabaaxufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_602c21a76c8d2.pdfIn PDF document text
    • https://wezisaveveto.weebly.com/uploads/1/3/3/9/133999444/pibudumisa_tofari_jupobanalofevof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_6029d2a4de24e.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/do_functions_have_derivatives.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/2903526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_601e38be18ad2.pdfIn PDF document text
    • https://fifabazu.weebly.com/uploads/1/3/4/7/134702458/4290250.pdfIn PDF document text
    • http://visiblawty.com/584018246039et37.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/rutufokedizon/ai_football_ggo_series.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/tamil_movie_bhagavathi_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/android_studio_adb.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/42315110904.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 4780 bytes
SHA-256: cec4c16fca6d84cbdab4a70646875f54ab552a9109e864700a270358dc30cf71
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11456 bytes
SHA-256: f78b784249164585a17b96aef185bdacd35516ef9c7d72e8b29b8e3b6d0f66ee

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