Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eec948dc20b59d4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 00:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c821042fcb51e4e985bfb248db66d0f7 SHA-1: e87eaaa5431838c523df50bda1b48b370d21ceb6 SHA-256: 8eec948dc20b59d453766752ab43209f4c3e31fc9f6216ab03c155fcdaaa13e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown PDF files on suspicious domains, suggesting it's part of a link farm designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fong-cai.com/upload/files/74450473462.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/riranizuv.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/rodemaxanudeji.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/87830419735.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109041255485645.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/88004937871.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/motexa.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/pekinuwizegexexonaj.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/zasuwijamavelasixupakuk.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/boxuva.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/fisutolubararufu.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/3613699141.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/89442052271.pdfIn PDF document text
    • http://congluc.com/upload/files/67780278013.pdfIn PDF document text
    • http://totoumi.jp/upload/file/34502166308.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/41376614975.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/netulasezeje.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/nitepigipokenowenoreji.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95804109646.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pojivojazuxanodunogurur.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pakepotoripeza.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132981d6a5c6---pafotenexilokosoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=file+recovery+app+for+android+free+downloadPDF link annotation
    • http://forum-auto.ru/data/files/zewiwiditexozona.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_off0000b7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 16952 bytes
SHA-256: 3546216f04c7e7214dc244be3ce76c8b69443cdea50652fcab66aed0e7a19362
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10588 bytes
SHA-256: 2c8dc93c88b421756e859cca593bd35bd024455ea0901a2f2d5be4d4ba82e22c
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.