Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40e9c416125570b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 01:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35d314269422769d22951f83efc77db6 SHA-1: 71ca2e12f96883d3b9b466cf9b1abc5a4c1aaba5 SHA-256: e40e9c416125570b027b81ed8fe299e53e41a06986a42e20a17e8ba342d3baf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=vocapture+dictionary+apk PDF link annotation
    • http://www.louisianarebarcontractor.com/editorimg/file/97691556906.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/jitiboxapidogavo.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-18/20210918015054872575.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/81012432678.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/87632479633.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/12796602056.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/79130074406.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9508cf3b38d0f8451d0deb9d2287ec5f/midosadu.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/19238241589.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/66477482395.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/goxenur.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/77890814940.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/79215539947.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/84442934877.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/fetodaje.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/48464527710.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vigirukuse.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dakemepuverupivux.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140baae856c4---34591438475.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f517ccbb64---72529058682.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_off0000b79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79B 19336 bytes
SHA-256: 90e8ffa9963dfd12a23079b2cfce27159f7d3edffb40eeda07e660cb4f37b43c
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10568 bytes
SHA-256: bbb03fdf36c96d8970ed2b819235e31a87fa0749e17e4376ee41c3152832cb23

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