Malicious PDF — malware analysis report

Static analysis result for SHA-256 646ac8f3aff9bf36…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 19:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba2f86dbaf9a7ed1c9afff5a7546e510 SHA-1: f9220bb50fc6f827b4b499abaeaa5edf45a3d73a SHA-256: 646ac8f3aff9bf3647ed6c9f32786529d4ca46e6a0ee27e07e280cb1f33758fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document points to numerous distinct hosts, with one specific URL being a potential landing page for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://bualuang101.com/backoffice/upload/files/kedomof.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f04a897d---modavixa.pdf
    • https://gianlucabruno.it/dati/upload/file/vuxirolila.pdf
    • https://terracell.info/images/file/83018577540.pdf
    • http://telegid.tv/userfiles/files/63267802228.pdf
    • http://tienphat.vn/imagesflashupload/file/78254794836.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/81660233760.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/1593882465.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/33142392823.pdf
    • http://freewest.at/36145411736.pdf
    • https://lasanisports.com/files/lavigalak.pdf
    • https://wodepcb.cn/uploadfiles/files/31820353646.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/78131267826.pdf
    • http://drkoopman.nl/cmsimages/file/97379653104.pdf
    • http://klhl.com/userfiles/file/vozoti.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/samisikezitefutopufi.pdf
    • http://spc1991.com/ckfinder/userfiles/files/rawolomimapokixozidorobuf.pdf
    • https://nucamsa.es/userfiles/files/1399314241.pdf
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdf
    • https://alves.bg/ckfinder/userfiles/files/kodesiwit.pdf
    • http://qazaqbanki.kz/data/content/files/bukapawetovirok.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/41000765205.pdf
    • https://atiksigorta.com/files/raruvewerodolupupotim.pdf
    • http://hoachattn.com/image/files/41154402779.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/jexozopodupex.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/fawigudafidavojuvufine.pdf
    • http://shiinamotors.com/js/upload/files/rinaposozututesuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=posterior+shoulder+muscles
    • 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_off0000e1e6.bin
61b4307b4618fcb06fc263386c02b8e7d555313f0ba9723be539a46cc882e8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 16836 bytes
font_01_sfnt_off00010d70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes
font_02_sfnt_off00012587.bin
5b6455cda294e2b13d249caf94a780401f1dd795ddcc412b04f32689cf7ff206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 10468 bytes

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