Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11ea6130b49902f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 03:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 022275bb10d46b5d5b7b7f6e1adfa8c6 SHA-1: a48f92c5834c82c0882fd651844591cddf15b8d3 SHA-256: b11ea6130b49902f667e81b7625ba95eae74c5c10ef5b61a08575054b5e8f667
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating the PDF's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://glampingcaravan.com/userfiles/file/20210913205006.pdf In PDF document text
    • http://mq-water.net/upload/xizazizosu.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kutazuzevejer.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/81914751984.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/62147916203.pdfIn PDF document text
    • https://hotelcorona.ro/files/wegofulifivo.pdfIn PDF document text
    • http://allier-genealogie.org/File:/gitede.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/sonafulajaset.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/39144606152.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vodidikedej.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/ruteguxoretujelabideki.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/13235398532.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/26828122214.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nelatusolezipo.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sidev.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/238755c3aa564231dde1c26438e9c0c0/ruxapotivagasuf.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/42519696561.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/36724594487.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/tixewedosizolufibe.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/90613957061.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b781963c---8773714521.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/60621680701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+way+to+watch+movies+with+friends+onlinePDF 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_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 11060 bytes
SHA-256: 3630eba9f08a1647a7ab6cf29023fb75513cdd2e4f7fd1de9fa59c9883a146ac
font_02_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 17652 bytes
SHA-256: 572596fa66151144832d58e6d0306f51929c865ea143855534a2666fb3fa47d0

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