Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3379884c551612f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 14:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e66c5779e3c2224c87cc95375cad5f6 SHA-1: be2fc2925ac8ff3e2c2c8f118655e2492617b337 SHA-256: f3379884c551612feb4aeeae6c941570e5d076423b75286f9a2dbdfd405e46bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://chandrakantmusicacademy.org/ckfinder/userfiles/files/28417233498.pdf In PDF document text
    • http://cl-pub.com/files/files/nosoma.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/74301499201.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/37392689728.pdfIn PDF document text
    • http://fygl.net/uploads/file/051655377954.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/gogudifikonox.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/11002175946.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zigarivozupusif.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/nifuk.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/riman.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jifagud.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/loboz.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/51500385948.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/11067059415.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/bijom.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109160624154960.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/86670684497.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/31860460136.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24138250608.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vutanaxuworumiwaj.pdfIn PDF document text
    • https://morabia.fi/images/file/20309212037.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd41578632---vojop.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210909_10469A515AF80D74.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/90329414752.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917042714813.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09371cba3---rinenitojitirokorajigugiv.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pia+vpn+android+apkPDF 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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 18180 bytes
SHA-256: 723d3cf34186fab74ab6d8c1ef439629b24b80013e9c73796d7eb8246d21188b
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 10100 bytes
SHA-256: ea999b376ce8c8933a7b86c8b940e83ab018a7f673b2464075cc8bcad926ec92