Malicious PDF — malware analysis report

Static analysis result for SHA-256 e007b3fb4dc1f291…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 09:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6a08c09567ee976b063e8f6da3ee320d SHA-1: 2fc57f977a5626615dc0c21264c7c49f1f7adac5 SHA-256: e007b3fb4dc1f291ced3d482492e4f4bec6691e1542dedabb10ab372a1610dd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lamay.de/userfiles/file/72977276626.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/kuxar.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/96259251550.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/48234815614.pdfIn PDF document text
    • https://esz.jp/img/editor/files/fejepux.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/60984809508.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161427be40c71d---xinovogus.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615809b00c977---75457035850.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/88539114830.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/24270508934.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e387e18581---53967035478.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rusijasojaferevajog.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/61361171821.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/43008600639.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/muxofakukopetexaruliwa.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/xuxasugiludem.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/bevowivoxevimud.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/68979055057.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gututojelipasogokano.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/35612225817.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/xizemuze.pdfIn PDF document text
    • http://abnicum.ru/files/file/benogumimetirewedafumop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=biomass+fuelled+power+plantPDF 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_off0000b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DE 16784 bytes
SHA-256: 87f57391671500c1560d54b0275e075590508668c40b50038514bd23b843c77f
font_01_sfnt_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 10900 bytes
SHA-256: be3db33ceb923f966ebbdb4dd72766c4f6c1da24b45ca8cc7b9d4d21b945a6e8

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