Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ea1945e917eee5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 19:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a085cb06e087a415f67d29f672cacb8 SHA-1: 41a6bf29c93590c82037d50263137abc47a5d7a4 SHA-256: e9ea1945e917eee5e985a7a4ef61b7b3d154a2faf3c8f652a80fc2b09d4a2576
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URLs are embedded within the PDF, suggesting an attempt to redirect users to potentially malicious sites for phishing or further payload delivery. No scripts were extracted, but the PDF structure and embedded URIs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://synerhu.ru/uplcv?utm_term=flutter+doctor+license+status+unknown PDF link annotation
    • http://talentfuturesservices.com/sharpinstitute/images/files/jelitadug.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fokiboxo.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/64278205130.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331701daf3a---fonotivivaji.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/9514059907.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/rorixepe.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/74848618174.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/7482701647.pdfIn PDF document text
    • http://frchem.cn/upload/files/suwutemujo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332753517fb---zofutute.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61903328221.pdfIn PDF document text
    • http://picassooutdoorliving.com/In PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/75055144952.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/sesijolowabozovolu.pdfIn PDF document text
    • https://laser123.com/geektic/files/fizex.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nifalarejuzelumojugi.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/pizokir.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/regusixepuxo.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/69626805373.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/vafovunewegise.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/892983995.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/71066152333.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109051802573309.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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 19964 bytes
SHA-256: 58fe3cb7a82c085de2a781176421c3ca9792e03230b78c57b93af245563f5b58
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10616 bytes
SHA-256: 6406fea25702f325654412ed69f6dd37304df00068dfb85630ecf1c19c44ad61
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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