Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7512440e7ad4774…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 19:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40f6767a4a2f4df1e5e23f6878643aba SHA-1: b0c5934f6a2c90bc578457941c556f2dcd422843 SHA-256: f7512440e7ad47746299d1b46fd88660e6a9f007ddfbcd83a6fbac63bd24de57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the document being used to redirect users to external, potentially malicious, content. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://duquenne-moteurs.fr/webroot/upload/files/90415423756.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131aad22527e---50664068645.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/97823678737.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/37511706678.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vefizalaxowi.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fatanuwituxomulemimimoxex.pdfIn PDF document text
    • http://health-bridge.in/upload/file/27810435132.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/57524432025.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gipexafogutekosasebeno.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/52925321675.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/48851882713.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/bisuwujeba.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dewukosodolupubusaraxuke.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090922520073499.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/91994976002.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/31361921921.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/66332560174.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vujikiri.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/27732117591.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jowififodin.pdfIn PDF document text
    • http://normel.org/files/upload/file/98487878390.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lomapewonagovuvudusimaf.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/51133678597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=do+i+need+to+factory+reset+my+phonePDF link annotation
    • https://lapdonline.org/file/merukerazid.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_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 10956 bytes
SHA-256: c535c642e60c4103c80c868c233ab5a999712942a02a0eb388d94d7bbbcf3da4
font_01_sfnt_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 17424 bytes
SHA-256: da174f3d86a52e0c9f7f2ad0d55175562498cd4b7310e2f59583ccdff065a4da

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