Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0a3e8bb351c965…

MALICIOUS

PDF

76.7 KB Created: 2021-03-04 14:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: eea417a843aecb0821519eb08a181a37 SHA-1: e270f75d684c579b0244efb2ee46fcfd25962c9b SHA-256: 5d0a3e8bb351c965a6ffe32c3ce8483ed59fc0d90880db4a7f56c4e2afdf36d4
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 the primary link pointing to a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://dafemum.ru/123?utm_term=oscar+lewis+culture+of+poverty+theory In PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ff56a6b787eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_600f1661ed6b4.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/7210255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_600bb8271c3d1.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/pekanif-fodebejamotex-baduwabizetut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_600c0e85b8e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fdb600e0f725.pdfIn PDF document text
    • https://peminikagi.weebly.com/uploads/1/3/1/8/131856713/didelamuv_kumoxek_jubirapam_nibewefumitesik.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/jivagajamav/pobubanif.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/android_kindle_app_import_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/what_does_soft_lockout_mean_on_a_furnace.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/rolaxutubinokepaletobeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/terewalikorukes.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/jiggler_keys_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/2008_kawasaki_brute_force_750_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/75603367154.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5384 bytes
SHA-256: 63ae79069e68510f86f240aa7fd745a273cda48baea6d5833903d3da8ed50604
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 10980 bytes
SHA-256: 532122cf4a9005fdaaca044ca32465e9829a347b77a956c7043f6d7a1fc0f83a

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