Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27e9fa8216fc84e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 03:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b27ec68f39d68d33b46b926ab538158b SHA-1: ecad2b5fb9f5dc3eaba995c90513b08818e7da35 SHA-256: c27e9fa8216fc84e25575986d8efe66e92e7d57f903cefc8f5f746bb6f02ffc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript likely facilitates the execution of malicious actions or the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trufeel.com/ckeditor/ckfinder/uploadfile/files/26733429735.pdf In PDF document text
    • http://e-junghan.com/userData/board/file/varifoganenorilegan.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/61229076402.pdfIn PDF document text
    • https://mediaskills.rs/files/69188887523.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/63968585654.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/18450957921.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/78153188597.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/vimug.pdfIn PDF document text
    • https://onlinendttraining.net/files/fezizejirimivevuboxa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71224042058.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/79167670564.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161460f94c2e6d---92210631462.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/33296847857.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/5779276763.pdfIn PDF document text
    • http://tencanpowder.com/d/files/dirujufavobof.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/xewazadewegiwusikot.pdfIn PDF document text
    • https://mkontroll.hu/File/lezaxim.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bilixowira.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613decbe34eec---38188883298.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/75945399598.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/dazon.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/72198717092.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/53141851316.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/juwis.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/48875778000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=taxi+5+hdPDF 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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 9776 bytes
SHA-256: 94e585c5a3c73b7e13941926cc1854e1c686fc66f8edd779eaecaffa4b675b9c
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 18928 bytes
SHA-256: 1f94dde8dc04ba6907dfc388a8375609a2456e4ab6f752b8c107650e4208c9d1