Malicious PDF — malware analysis report

Static analysis result for SHA-256 5881ede1c146fcda…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 17:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2b6d906bdfe3e1c708fa16d833ed6fc SHA-1: bbe4d9d2706974485238850521fed6502d210d03 SHA-256: 5881ede1c146fcda2eb14c9c36c19916f1a95a0a77da4a6b8d1a5005fc3471c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting it's designed to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct, disposable hosts, reinforcing the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://tolgyesvolgy.hu/userfiles/file/wopubolagoxevozoboximuze.pdf In PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/xazodekafobu.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zozasebi.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/30999344653.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/48f03f77007b9eea52d2fc8be8c144a5/22092687881.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fenemexejuzejilul.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/29308289602.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dajoxojegodejumazu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb8d5c9d0---65638875711.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99907248660.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kebuvomejamoxudulunol.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/lisepolujum.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vanijumovedemubusovemagi.pdfIn PDF document text
    • https://windsbs.biz/files/file/97751907493.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/25139407180.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9261btptn42v2jhj038mjts906/pasalaziverimeze.pdfIn PDF document text
    • https://revive.fashion/upload/files/luvikaji.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lonalawilifetejazaferi.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/30936785638.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/58495828851.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/6120418099.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rosis.pdfIn PDF document text
    • https://stauber.lt/images/files/toxenabaxij.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1832388206134618fa6e95.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/7915979992.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tesufegaxewamoluxoxazax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=resident+evil+5+for+shield+tv+apkPDF 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 17392 bytes
SHA-256: a48b6a2ba2eb2c1296479ea568cdf3bd425e988407c29eee1e31caed9fc6435e
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10932 bytes
SHA-256: 95209d200f185694b18f7d0d61bb90200d68e7af189c99a6994282e45436bbeb