Malicious PDF — malware analysis report

Static analysis result for SHA-256 7643d5c0636e484c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 06:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 009dd594c65da3182bfb1d8578133ffd SHA-1: 558d5f48d7063d2ff12a9d9169cac4c8f8f4e4aa SHA-256: 7643d5c0636e484c3217c70454d246989e745fdbff252d741d8274709beef514
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicating an attempt to redirect the user. The PDF structure and embedded links suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=pronouns+that+start+with+c PDF link annotation
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/firofutakelegupijo.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/64799782934.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/bisef.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/wifazawaxezezusilas.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/dukofaxo.pdfIn PDF document text
    • https://invest.pl/userfiles/file/1709733223.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/bofeliwulod.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f949ppgotcbnqtmqbkcars7987/kokabekaxo.pdfIn PDF document text
    • http://africareview.in/userfiles/file/duvimabiperopabi.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/zuxaxojefelaxexabip.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/duoarqe24ad1ibumbbjfoj1sj7/forurasegebenu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_9DAA0E1AEFE24BB3.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/78706148052.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/32096850676.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/lexigebuzimupotaferawuxe.pdfIn PDF document text
    • https://penal-garazh.ru/files/merenotipemovobunipimuj.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/21954678372.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/daxupatizev.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wekumevurodidenu.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/31093047364.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/58652334331.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_off0000ac77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 10336 bytes
SHA-256: e47b4f26f401b70c66f0c663bc501eccb9de985f6ab847ae2f9da2e5f955599c
font_01_sfnt_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 17184 bytes
SHA-256: 66ac531a1c16c4cf9a38f1bd64959d6d6c11b6a38e9ed8077e0f8e74efa8dae1

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