Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae4ee7d39d07e7c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 07:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b3aa62798c27567c36b3efd73f1dde79 SHA-1: 8ba7a1c4b482dfdd0fa7bb378ebf19d6fcd48561 SHA-256: 6ae4ee7d39d07e7c0858bd9d7af774f12b29c3cb62fb109398779dd97397236a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous distinct hosts, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/benozatokom.pdf In PDF document text
    • http://pneusmarene.it/images/file/nepisinenaputusoxa.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pubakuxifafomalowimakus.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zakekovaj.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/13085128201.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/laligejuzefeg.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/jodugodagazaso.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/voboralotukupikumasole.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/17066703596.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/dobojitudaparovabud.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/goxewaluxe.pdfIn PDF document text
    • http://www.agot.pl/upload/file/vozevugixupefapum.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/19791958492.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210909162025.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/4976082514.pdfIn PDF document text
    • http://htwy.com/upload/file/kudaxitemupodafetifetem.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/71899666276.pdfIn PDF document text
    • http://tecksco.com/upload/files/19193070136.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63788375855.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/dopexumasorukemevi.pdfIn PDF document text
    • http://erpos.sk/data/files/63490099688.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/gexisufuxipaxegamus.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jelivufupasasojoxizilexel.pdfIn PDF document text
    • http://schokofontaenen.de/idata/desusodidafawiwel.pdfIn PDF document text
    • http://asfalon.com/__files/file/80897104587.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/95664574286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+money+code+pcPDF 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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16740 bytes
SHA-256: 47d55e64e1ba754ac2c56cc127a9600373cf7191263927fcb55c12930037ba6c
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 10556 bytes
SHA-256: f2ecbe2fd8836577799afab0cf5cb956ca37b99f8230d14399c57ec9027aea67