Malicious PDF — malware analysis report

Static analysis result for SHA-256 d644bcaeddb062a0…

MALICIOUS

PDF

95.2 KB Created: 2021-03-23 03:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beae761c02a29555a5d65759356c1964 SHA-1: 5866aa9cf202dd7826465bd9f396776d2f658867 SHA-256: d644bcaeddb062a03156878269364ed27d64599caaba086e1990ab61ccc09629
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The primary malicious URL observed is https://kuzutuzo.ru/wix?keyword=5+finger+retell, which is likely used to distribute further malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=5+finger+retell
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/6b76b42.pdf
    • http://steblin.pro/annapurna_trekking_mapzsisq.pdf
    • https://cdn-cms.f-static.net/uploads/4379473/normal_605406a73e6da.pdf
    • https://xunimolozabipos.weebly.com/uploads/1/3/2/6/132681728/ebc8a449212dcd.pdf
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60592920b791c.pdf
    • http://copyrighthelpbusiness.net/naxetonivudzzm84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalomi/roronuzu.pdf
    • https://s3.amazonaws.com/baposivarabuj/jikuluwegozo.pdf
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_6b7cc9c8ce2d47e8b786ce4671e277a7.pdf?index=true
    • https://s3.amazonaws.com/xulepiwa/vogojef.pdf
    • https://s3.amazonaws.com/kelukakeb/cabbage_plant_pictures_free.pdf
    • https://s3.amazonaws.com/laradusa/19833819574.pdf
    • https://s3.amazonaws.com/zobuwubedak/teaching_literacy_skills.pdf
    • https://s3.amazonaws.com/jozaponi/whatsapp_business_for_iphone_free.pdf
    • https://s3.amazonaws.com/gixirojozogufux/80108986531.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_3ee629504298416990fb0a3e847b8087.pdf?index=true
    • https://s3.amazonaws.com/liluvad/is_papa_johns_gluten_free_crust_keto.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011041.bin
8c7d19c5f97f84c488b30f3d1e2415ab561a2bff7dbc97f4405e82db792a7af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 6676 bytes
font_01_sfnt_off00012117.bin
08db3bda4793def22f7cf2c73e965c52a99c32b2efdd704e3ee01c70f34c1f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 4576 bytes
font_02_sfnt_off000130bf.bin
0cc3aa33b9b312f40106bb639ae66df29892d51e4807b829635c32936200f43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 12136 bytes
font_03_sfnt_off00015a54.bin
c286ae503dbb916287c5e5a2e442390a905efca754cab290eeee8b305ba17365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A54 16120 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.