Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b213b404eedec5c…

MALICIOUS

PDF

65.4 KB Created: 2020-12-21 13:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1133f08df8a9f3bcebc7da9de8c8c2 SHA-1: 5c5edd424cc3c51facf8f423aa2d3b7290c5ed3c SHA-256: 0b213b404eedec5c1f7d16ffb62b830b10309b6fc18bfb072999d16184fbf360
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The presence of numerous external PDF links also suggests a link farm, likely used to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=joseph+mann+%2526+creed+shaker+heights+oh
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/vasikopazisu_suraxitasamelov_fagasolenug_pawisowakubot.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5fa6cfa72cdbf.pdf
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/6785674.pdf
    • https://cdn-cms.f-static.net/uploads/4461744/normal_5fdc233df1ff2.pdf
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5fb29a4370f7c.pdf
    • https://cdn-cms.f-static.net/uploads/4450145/normal_5fbf24cd2cc53.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f9d09039a609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bawalidamovidud/neoliberalismo_concepto.pdf
    • https://s3.amazonaws.com/nitajosasa/bitdefender_antivirus_free_manual_update.pdf
    • https://s3.amazonaws.com/kitakilesa/25278734479.pdf
    • https://s3.amazonaws.com/bexolamabad/loditepigi.pdf
    • https://s3.amazonaws.com/nitatotol/pekuxilaxesinukenakizek.pdf
    • https://s3.amazonaws.com/xujitezu/bomirojiboba.pdf
    • https://s3.amazonaws.com/nodetuxapabara/kalvisolai_10th_english_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b3.bin
44450383839baaf9a541a1158a85cc05e3eb4dcd6f1414f58dee217a22ddfaa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 4920 bytes
font_01_sfnt_off0000d546.bin
8f276e4bea5a8f98ee70874d1d3268d75f99e7f05154cfcb503b8c014cb537e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 10616 bytes

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