Malicious PDF — malware analysis report

Static analysis result for SHA-256 609408438f4f6f93…

MALICIOUS

PDF

66.0 KB Created: 2021-02-22 12:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f284de157d55daa3e5026c66dc3c879e SHA-1: 427e0ffc2e3f0a181278ef0cea9f66992066ba59 SHA-256: 609408438f4f6f93935a31d275246829c576fa4bb0462c05303458eac32390cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://jacksth.ru/wix?keyword=bissell+2314e+sturdy+sweep+manual+floor+sweeper'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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://jacksth.ru/wix?keyword=bissell+2314e+sturdy+sweep+manual+floor+sweeper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fe805dc50220.pdfIn PDF document text
    • http://usesucre.pro/the_handbook_of_fixed_income_securities_8th_editionqo8kh.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/aidyBjR/3365524036.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/3204537.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/jiW7jiC/best_instagram_captions_for_pictures_of_yourself.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_60038b95f21e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6023db5c9dd67.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/falevi/xikozokijuviwanadep.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/lunixajemefovitebar.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/medical_books_free_websites.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/bedingte_formatierung_excel_2010_zwei_farben.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/rujijasukosagonusore.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/kojafoxavelejavolarefot.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/96841485760.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/fishing_report_captree_ny.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_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 5868 bytes
SHA-256: b8c07125399e1cd4b1701cdc3de60c52884b086792827b5397e0af44f7f37e37
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 9960 bytes
SHA-256: 39725fc93099e2c0328eacc313d1a865529f531d36e975b63bdc5ef2c26c4cb6

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