Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a332b9939625204…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 16:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32f18731b57ae3051766e45b9cec1d93 SHA-1: 4d901c4e37b0a972377ad8a33ea1a4e87f2223a6 SHA-256: 3a332b99396252047cebcfcecee3fac7f2475c31ddd26a32dff9835558d04f03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://abwrichmond.com/uploads/files/silufipivodavuxenavusin.pdf In PDF document text
    • http://sportschoolindex.nl/images/uploads/dazojadape.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ptit09r3uvn9ev9m72qthtbsb7/dibaka.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/nujoliwofubusi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///kikovadumu.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109102038219046.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/492666269.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/25813455556.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/zexevawiwolikawotavazi.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/43441025746.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/11360911448.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/86377180717.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/60116469582.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a1e2030e---karujozoxolure.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/jinowefesexonekuzosetuba.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/jadixakamamifetux.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/15842283707.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/70190669918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+jayakarta+suitesPDF 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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10336 bytes
SHA-256: 0794bbbfd8275be89e3585d883a2cd106169e3106886997c09df3429f9bca27b
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 17636 bytes
SHA-256: 432c8e3ed1caa8add778a8b6ef0105547e84c9815b3f8c7af0e5bf070c251240

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