Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b3a10d3a1826bd…

MALICIOUS

PDF

72.8 KB Created: 2021-10-02 10:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d462e0c583623a3896180ff1eac696d SHA-1: 4c80c8940a8e6aea73c0409f0a68f158f0dd59c6 SHA-256: 11b3a10d3a1826bdc41c4fa56f2d10936d64cbaa7dff3525a9acfa9236fc77fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on disposable domains, suggests the document is designed to redirect users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cross+validation+decision+tree+in+r PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/58707553145.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c425d4da5---19479205660.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/59378442327.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/93225015143.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/jurepozukuromog.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/kutulegiguzajalefufug.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/lokenise.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319d3a91925---jegakevaxasijuwufemagol.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210919060755.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/42292320747.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/ruwepozuxebonino.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jisonixaxuke.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/kawisipakonekem.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/54643560756.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/mamefalezumeteberu.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/2337737192.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/34307915719.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/lizovapezo.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/48692924151.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/63258414906.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/67091787883.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910165813.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/kojukefobixeko.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 10460 bytes
SHA-256: 998f6ae84d066e92254fd4f16c087b55f82663ef0b9ba2cdbd7e17e9d35d3168
font_02_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 17932 bytes
SHA-256: b240dde2c8de186c70141aad29571cc2c8f5b07095e6a5048f3feb31e352555b

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