Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d60a6c1354d87c…

MALICIOUS

PDF

75.7 KB Created: 2021-03-13 18:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b751d82a43b47ee3fa57cd53a4e94d8 SHA-1: 6ee2cf4334274697f6d9b680af4f31e97504e432 SHA-256: c9d60a6c1354d87c5b4eb2250578bcdbba5abc6fc37bf615d88f896f463431ca
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. The primary URL, https://botokaw.ru/wix?keyword=taylor+kitchen+scale+manual, indicates a lure to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://botokaw.ru/wix?keyword=taylor+kitchen+scale+manual
    • https://cdn-cms.f-static.net/uploads/4393034/normal_60133bb5c7ab2.pdf
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5ff57e8619e8c.pdf
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fee34ba344b9.pdf
    • https://cdn.sqhk.co/fuzekofuwe/JxIwjbX/analysis_of_algorithms_mcqs.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_601967d050de6.pdf
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fca58c9d251c.pdf
    • https://cdn.sqhk.co/bepemuno/gfNVham/zapugilebamebemamixulo.pdf
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5fe171c0c9f8f.pdf
    • https://cdn.sqhk.co/zesunotu/JnGiaFK/tixazis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a9f517e5-fea7-4905-b2b0-b00a2a9915ad.filesusr.com/ugd/d55797_60d694bddbab458cb788e8e8cee9cacd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9088d86d-bb54-4e05-a2d6-22e9f27bf9fe/18236330156.pdf
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_eb6f692216184ec697d7d1ac5fe40730.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6bfea1c3-124a-4bea-b78f-e861754c6da5/74473849871.pdf
    • https://s3.amazonaws.com/widiku/sikisemumi.pdf
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_81e850a7926745949ee22a9c7d4303ec.pdf?index=true
    • https://s3.amazonaws.com/jasipefulaxiduj/50843290697.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_off0000ea41.bin
1c7505eac33552d9419126a2f72db4f01c17a1d9e9ff79a6b7daa7294e25de93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 5152 bytes
font_01_sfnt_off0000fba4.bin
b81a75b2176ad31deec749fce97ca6e2ef857fcf42d7d8087cf80bb0b520aaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 12000 bytes

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