Malicious PDF — malware analysis report

Static analysis result for SHA-256 414dfed88564e856…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 03:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abdd78778d7f47afb3570e61ba87e347 SHA-1: aaa1ba651162ccc0f2cdbde44633eb60ef64d674 SHA-256: 414dfed88564e856ab30c03d0753882e30d75bed1f29ada62d89bb9be8a3c520
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document functions as a link farm, directing users to multiple external PDF files hosted on various domains. This pattern is commonly used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://runbo.net/upfiles/files/16309634013031.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/dekipet.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/ginolunopopafojekumajip.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78101032701.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xadezebeguzafujabudik.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/linevev.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39918205854.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jonajetojujagi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/felemuxexekalarabago.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210904064934.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/kesewowajadowedifafefiri.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vububekolonozoxujapotemi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138869924a26---nipokulotenunakarav.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/pesobufumubalimosarawob.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fotipajoselolezomomopa.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3d34e3ca---30213174155.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/82394386432.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/zepafubepo.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/nokusimivafamubanibapez.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/lozukibijenorimobazuma.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/21086580675.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/6570002180.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/89706254869.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/gixodudokudigazuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=videobuddy+free+movie+appPDF 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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 17012 bytes
SHA-256: 3839483d5bb883bf58de8a66cdc780d0c44947bc3ea032ad72b1fd07882bf46f
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10632 bytes
SHA-256: ff8018a12183bb2f6ac38a1dba913c49575fe5e71311506fa0f7dc04fad9e8e5