Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc63b12876ac6fb3…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 10:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ccab764c5368efaa0674f6bc1c37d61 SHA-1: 810a1f7eeddf8f960c13408a9d09cc260b7d8c40 SHA-256: dc63b12876ac6fb36c008c7f45b3cf48b977dc1d3646c1cbf620188713d9a0b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • 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 http://smartickgroup.com/userfiles/39723186018.pdf In PDF document text
    • http://nanumed.ro/uploads/files/61517250327.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/20550692849.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/74451575384.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22341931594.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/lekuxefuwum.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/9771194950.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b545c6dd2b---47710970965.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/52231269313.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/bemulexajumofo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/pipojojaruro.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/64638760654.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/texizo.pdfIn PDF document text
    • https://jurad.eu/files/file/59637124382.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/91852570801.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/3499820528.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/dajezobuxiguzupovagumed.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/58866747670.pdfIn PDF document text
    • https://tessuno.com/upload/files/6139929c63851.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/xugukidodekujefi.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pavuzawamevomi.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/timumunabimuvidoxapiw.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/15698096450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=avancemos+1+cuaderno+practica+por+niveles+answer+key+pdfPDF link annotation
    • 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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 11272 bytes
SHA-256: 896e2db682b786992e52f25c196b596cb6691f8944fe70c1891a7b133dd3584e
font_01_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 19404 bytes
SHA-256: 581fed4b2a44d27dee7aec2b1673bdd89831a68c420edecb445a1e1bc713b2d9
font_02_sfnt_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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