Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52fed1655e87dd5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 21:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11e177826aed251a9eca4f28f788b3ec SHA-1: aff5624a1066a87666ed782207994d24b658ab9e SHA-256: e52fed1655e87dd53823155395378d5a383ef79968a5f0f3d5dc640ac904866f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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 https://wastran.ru/uplcv?utm_term=highster+mobile+apk+full+cracked PDF link annotation
    • https://isuzuphonoi.com/data/dulieu/files/84132247268.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/11592733380.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riruwojuboxegawijada.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/16740182255.pdfIn PDF document text
    • https://bunianco.com/other_files/File/gakidexurirejivo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/55907881837.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/weguxibugukobiselul.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/95228450587.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/sarawiwavivigunaveze.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jekovimikigasowubo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/nofup.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/307eb61f0b212df8cff1589cd5f93691/jaxedolijug.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/93390032146.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/28950476.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/gomuxujapaguk.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/lowakemuwaverebukore.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/lovivafisajomomikuwu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/natiwawenobawewubaf.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/92390099339.pdfIn PDF document text
    • http://sinoorchids.com/image/file/widixav.pdfIn PDF document text
    • https://phm.vn/upload/files/80943280792.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d485a0fac---fiwezuw.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kuwuli.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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 11284 bytes
SHA-256: 2b776a5aa2d78f016a01c41071bf1cde8c0c3496a3710342c9b99bc4c0872f97
font_02_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 17476 bytes
SHA-256: f77d10364641136f1df33456e08c44d93c30230f85583de6b857f2830c51bb3a

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