Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f0ecd26243a7e…

MALICIOUS

PDF

69.5 KB Created: 2020-11-25 08:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9fc6b7526e5951bf1c6bddec608612cd SHA-1: 1034fdb2914e1ab1df535b16278f37b97ac9bb8f SHA-256: b24f0ecd26243a7ee7b47a4709f3af28d97b45ad50c8a2e327e5260ef95fef01
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a phishing or scam campaign designed to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

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://gettraff.ru/123?utm_term=adel+trinity-788+and+diy-3398+handle+spring In PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/levifad.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/moxavarobalopuzi.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/baridujuxopix_kizabukoterirus_fejinidibuvegek_fununavuj.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/6bc1cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f9e72d976639.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/sawosi.pdfIn PDF document text
    • https://xokiguju.weebly.com/uploads/1/3/4/6/134679394/b61dc7f899412d.pdfIn PDF document text
    • https://nipokilalupa.weebly.com/uploads/1/3/4/4/134485501/tuxume.pdfIn PDF document text
    • https://wofarugufi.weebly.com/uploads/1/3/4/6/134657174/e50add052bdff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xojafemori/latipisexusofozalusatabug.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/modarigojozafasu.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/44021355564.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/introduction_to_naval_architecture_thomas_c_gillmer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 5616 bytes
SHA-256: 6d4b8213c0012efc0c77f1bdf4b93ff5dd8219246ddec2f36e4d05cd4f9c781a
font_01_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 13688 bytes
SHA-256: 9c8c13b9e39a3f0d8d70c601562463cfadeff81376da3c2c1ea1abe83d8ba50a
font_02_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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