Malicious PDF — malware analysis report

Static analysis result for SHA-256 8714dac372fee969…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 22:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efb1fdb9c10cd321718330a002ea3d08 SHA-1: 6b4b066cebfa4488916caf5e6dc67335c2b4b257 SHA-256: 8714dac372fee969f391e01d92032be22f046037cbbee73376529723ffeeeb37
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 hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://lactopad.com/uploads/files/tarofozopaxij.pdf In PDF document text
    • https://adminico.nl/userfiles/file/37015727688.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wajagegufakasinepug.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161378e436d63c---zadebejovudubinufaf.pdfIn PDF document text
    • http://15881588.com/ckupload/files/67518565063.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/rekem.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/nusimepibiwonakigibusavo.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/99876802112.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/82514212463.pdfIn PDF document text
    • https://bloc-immo.com/images/39440458564.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/96074386671.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/xunijore.pdfIn PDF document text
    • https://lordoptika.hu/files/files/22428981163.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/68556939071.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/65614174821.pdfIn PDF document text
    • http://erpos.sk/data/files/93561593589.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/79215539947.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rofipakixevuxemojet.pdfIn PDF document text
    • http://deauville.ru/files/file/46196905198.pdfIn PDF document text
    • http://otczenacts.com/media/files/mixasubulinubavufebiw.pdfIn PDF document text
    • https://venus-forever.com/image/files/zikapadejubanadaliz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133025408990---rodobupikifopujujezafijun.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/getafovepagumimuta.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/xixab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=demon+slayer+episodePDF 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_off0000baad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 18760 bytes
SHA-256: e1dafdc0d55ba4ff6c8ce5ba66f4b2036bdae1afd36849cb3ab2c7b510a7a756
font_01_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 10568 bytes
SHA-256: b5ed764d3776d97ea676e61004136a815215d7338ed947c296ea1b6ee3cbbc7d
font_02_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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