Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece1d51a8a542b0c…

MALICIOUS

PDF

76.3 KB Created: 2021-10-05 00:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0035764bd70230bca87a7a32474839e3 SHA-1: ea98988205218eeec8d05794ab979725895c6443 SHA-256: ece1d51a8a542b0ca5ff0c8aac8c12dfec32bcd9eb8a9d752e65cac81cc47cd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the document, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document being a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

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 https://medvor.ru/uplcv?utm_term=game+theory+and+public+policy PDF link annotation
    • http://samuiluxurytravel.com/Uploads/file/tuxarunoromiraju.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615582eadb6b6---ligipekelowodiwidamalexa.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/55756956283.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/38925102904.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hpbvarktjuq9gvdaahkfqmqqm7/93146815968.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/wovitugowafuwesipivoke.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/releji.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/pegexigev.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zafotami.pdfIn PDF document text
    • http://tzsunup.com/upload/29679583864.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/vafuz.pdfIn PDF document text
    • http://nemalipics.com/faluzadi.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/13335601548.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/33782386254.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/13958642851.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/kuzubosafodefax.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/vikamezibikilo.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/maputonimefizesekutuv.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/botadusofafu.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josonolekixava.pdfIn PDF document text
    • http://hevolta.com/upload/file/99405671280.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/kekuwubemozitunex.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mawurefudego.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xagowewuzirijapu.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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 16612 bytes
SHA-256: 40f2de885f4e799d120ec754680bb759a9f060d06973281278a59c0f3efdb9fb
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 11004 bytes
SHA-256: fe48ccbdc46f7e8465a83b748f742e274288f6bc94ddeb9a88082b7f5a0fca43
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1