Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c5879ea6110bf6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 651360ba7231eb8e56d2ce3519b5f03b SHA-1: 90c9d3f48055bac442386b33772fccc0fdded0af SHA-256: 90c5879ea6110bf6e82ea322c12d61dc0dff41008739db187bc9c9c384e1960b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=ipod+with+flappy+bird+worth PDF link annotation
    • http://productinfo.in/konadnew/userfiles/file/xamukijalevomobuxalo.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/96534741915.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/voduvisafiji.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/78642636150.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tivixidifotitaroxugumona.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/86613138034.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zegobu.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/46372108192.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161370e75454ba---tutipo.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bavitutavobakosil.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/27159412574.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/nofida.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/milipemad.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/vowafanudukojolapopefa.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/wijolosopab.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/76008477857.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/domit.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/26898676829.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/paxevuk.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/nusubazoruzub.pdfIn PDF document text
    • http://hidropro.hu/upload/xukobiloripavoxuv.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/6719183169.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1331359930.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 19016 bytes
SHA-256: 7bd5d16b141ef57bb78d842beda051b5c0b17c43f56a3ab1a01e86500eb68c02
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 10484 bytes
SHA-256: 891d3051b8a1e420b0aa54bab08a47c07a21c8435747f92b0d4ed96dae759eb4

Open this report in the interactive analyzer, or submit your own file for analysis.