Malicious PDF — malware analysis report

Static analysis result for SHA-256 e525565537bf1c51…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fafcae5675378265e734a3a2cbd87c44 SHA-1: c9f41fe1d98b2b5359861e35147510ceedce515f SHA-256: e525565537bf1c510fdfea1b65528efeeaf9af9907b736e146b6403bc7fa9f25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to numerous disposable domains, with a specific URL containing 'utm_term' suggesting a tracking or phishing attempt. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=content+provider+definition+in+android PDF link annotation
    • https://egyiksem.hu/uploads/file/52748513146.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/saxiketibu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/3481159869.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/telixe.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/lujiwaxuwizogerov.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/83130298542.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/75673751614.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///77738582980.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/53931238208.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/jukuduwazetedelatiwetuv.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/10235058762.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xuzawibejusumibonem.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/20197573776.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/9323814475.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85263110989.pdfIn PDF document text
    • http://vanhacollection.com/images/files/41270241945.pdfIn PDF document text
    • https://majubesar.com/contents/files/78777150411.pdfIn PDF document text
    • http://polipack.ru/content/file/wobutezovejedetidepomel.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/93832063898.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/84221253627.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/48148485245.pdfIn PDF document text
    • http://farashimirooz.com/files/veziwelirelafuriba.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/pujosatakis.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/79564719087.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/37473930767.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/bagejejevobibabilikelosa.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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 17928 bytes
SHA-256: 61b69cafe347b0ab14ef62742543c4a1eecfade6f4493b236c82ff44cb297946
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 10376 bytes
SHA-256: 334c230d7aaf9beae3650638e0e49e33200ac0b9ee61acbf41d579d346065dfb

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