Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f09348023277ac0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 00:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f435fe76e4dddde670fc67f07ca40dc SHA-1: 3bc51ddaa0feaae652b91fed07135b9de99b211f SHA-256: 2f09348023277ac0c35c21cd4a54a78c4cb9d9ca6dff4a5abe78eceb03104a4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a critical ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicates a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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 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://philabc.ru/uplcv?utm_term=racing+games+to+play+with+friends+online+pc PDF link annotation
    • http://xhiehchin.com/Xhieh_News/_file/likisijifiwaxiw.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/68623598293.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/xiruw.pdfIn PDF document text
    • http://aprt1day.ru/file/86679797355.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jitadasijiw.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/fenonepozebamefinilaxe.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/97043241523.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zaximuxusuzifexejakub.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/viparu.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/zerajuzuzanozof.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/witurabukasovawoxijizo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52defdffdc6ed28ea1e275ecbf427392/3488721742.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wivovumuwolakutusinaf.pdfIn PDF document text
    • http://unibox.lv/files/text/borejawoji.pdfIn PDF document text
    • https://binhvi.com/upload/files/71394082919.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/75341648150.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xogikizawajumuzekepi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/nonozutedo.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/32814008674.pdfIn PDF document text
    • https://peterdegendt.be/file/mefure.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/86049212313.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/66990042969.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/digosatomominorobo.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_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 11312 bytes
SHA-256: 4f1491c0e4fdc099d3de3db65811482728e5286f9b933d5f300dd7137c749d7c
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 18088 bytes
SHA-256: 08275081d855388dec516ef57ad20ff426d96d8f0cf48480ebcb4ddf37d7628a

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