Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25da422fce48207…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22e1e9927b5494dec9fd47df1ed250f6 SHA-1: 8e9b914e02af34f7cc0f0b1fba15bd05c81f58dc SHA-256: a25da422fce482070f8a27ef9355815145bbb51d3da8a19c0b2539f72a94f103
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nbc.ua/design/pic/file/16056140117.pdf In PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/40942550940.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/xivubufev.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/76012213906.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/pisivemir.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/7396813348.pdfIn PDF document text
    • https://e-midas.ro/files/file/45910003376.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/bawinuko.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xozijopileveki.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/boneripuwilakaxevilasa.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/76065543405.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/81173797626.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/71291919010.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/21978837207.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710d085ccb---wudisawow.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/27190867408.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/gilul.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/97560885248.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/36430630918.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161399b2d2289a---64897807230.pdfIn PDF document text
    • http://sial.pl/galeria/file/36433415128.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210904012258_1786606020.pdfIn PDF document text
    • https://dukupahit.com/contents/files/36855455067.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/nuwezisozuvazawelizemil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=filmora+app+for+android+free+downloadPDF 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_off0000b783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB783 16836 bytes
SHA-256: 270577853980880f65244fa6c4b0cc6c4819799afc545d0894a8d199d31e9819
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10456 bytes
SHA-256: 40221c53a70ea8baa2634a19ed067fa92ae707baaa6c99c937c8cd18bebd7dce
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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