Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb00dce248dc4070…

MALICIOUS

PDF

91.0 KB Created: 2021-09-19 07:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cf9e168597d215d8b138cd7ba3a507d SHA-1: 393954a43e96a387205b9b5db73c327b17ec0e87 SHA-256: eb00dce248dc40706aae20e72bd1499c6c05af8dc2f2f904ac2fe143a8ed2558
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://coretry.ru/uplcv?utm_term=restore+iphone+from+android+backup PDF link annotation
    • http://azizolace.cz/images/file/84508324654.pdfIn PDF document text
    • http://teakdeck.pl/files/file/legogute.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mebizito.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109161724414424.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/65064642272.pdfIn PDF document text
    • https://stauber.lt/images/files/vupekuji.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/34763118668.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/13924119377.pdfIn PDF document text
    • http://serting.eu/userfiles/files/5401908252.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/68804776886.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/metijepuwikabipodit.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/nixiro.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/91855916189.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/4837901150.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mixobazuwabegusojumedur.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57285329904.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gudusotigi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gomupuno.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/medanuxanutobepa.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210919073717665965.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/80364519613.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/lepikadila.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/61624585681.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/74342898028.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/keguv.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/10781521860.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161426e061c741---2808360176.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_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 17628 bytes
SHA-256: ac3afc1efb884c336b70abb9fc3055d2c2691cee5ee64bfc13d22e6443e85fef
font_01_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 11216 bytes
SHA-256: dcb49f7ed320f33d220d9c798c545e11f13f675a890061290fb6fdf6bdaa1359
font_02_sfnt_off00014601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1