Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fb73a7137f7675…

MALICIOUS

PDF

71.1 KB Created: 2021-02-21 22:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ece70d5df03983c5a8fef6ed2fda60a4 SHA-1: 7022f095ac6d0d4cf3d9cf4f7dad8385154a0a11 SHA-256: 17fb73a7137f76754eb6c8f47b3e26944144b6100e8d6d1262850b4b52175406
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a mass external PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. While no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wb?keyword=google%20map%20washington%20state%20usa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451760/normal_60234a67be1d8.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/kzjeohd/70523034515.pdfIn PDF document text
    • https://jososipiwudamuw.weebly.com/uploads/1/3/2/7/132740918/4818839.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/5ac705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcee74acf55e.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/bxjhab5/zilimegagure.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/f6ojcha/mabikeda.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/ec28e2.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/4258149.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/najubu/staining_methods_in_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/moses_prince_of_egypt_movie_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/snacks_recipe_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/54871869668.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/nebejikusudariforuvuxed.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/sepixusosurapubuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/35885806984.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5260 bytes
SHA-256: 016a39d9d01e424a239946264542995da99cd8e7037cb9ee5ca2df7ffd13554e
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10660 bytes
SHA-256: 6fb79347267c6518e766f6cca3537cd9ee3207636418a57ce5241f8647224fb9

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