Malicious PDF — malware analysis report

Static analysis result for SHA-256 d674a3df808bb355…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 21:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c08c5217689a4805cb23a58bac92097 SHA-1: f32389e91009115708fff374ed7e5ea552bf0a71 SHA-256: d674a3df808bb3550a7d2172f4e94bf21f8d5ce3c8b3b6fde5d007dbf2406b39
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://egyptsuntours.com/userfiles/files/85100369033.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/13363756405.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/sumaretusobosatelabemamez.pdf
    • http://yildizteknikelektrik.net/resimler/files/tibafubivij.pdf
    • http://aygroupmuh.com/image/files/78304425125.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mefulomi.pdf
    • http://kaus21.com/userData/board/file/51323481420.pdf
    • http://orderkai.com/uploads/files/samikibomogomojokasowul.pdf
    • http://balaton.varosom.hu/userfiles/files/39373594903.pdf
    • http://techbico.vn/uploads/image/files/kodijulitunagukaxer.pdf
    • http://sage-chem.com/image/files/20210902_055219.pdf
    • https://er-cardiff.com/eurostyl/photos/file/bawiwelamugigozin.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130670944125---90241781785.pdf
    • http://vibrobeton.by/pics/files/73911333167.pdf
    • https://forssh.com/userfiles/file/94645464994.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/bijorarokawiv.pdf
    • https://biroestarsa.hu/uploads/file/27031554950.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/59525763164.pdf
    • http://tw-tms.com/uploadpic/xw/files/72225512925.pdf
    • http://iburgisidimarsala.eu/userfiles/files/lutuz.pdf
    • http://pincailight.com/zk/UploadFile/file/2021090702385073499.pdf
    • http://highendschmiede.de/highendfiles/file/raziralapunesezijeduvuwab.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210909_42EF589357137A5C.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613923c8d0a17---81810750015.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ms+office+2019+download+with+crack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d1.bin
8faea157437d7eb858155ffca3fa0a7c2d7b8c1a64bd03a854fa5151f5ae141f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 11208 bytes
font_01_sfnt_off0000e03b.bin
4b373344027bca7303d8e397b1fcc66ee1652648bf338631812ff921fcc68448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 17168 bytes
font_02_sfnt_off00010c7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 16792 bytes

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