Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e3689a58ba921c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 10:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1eca894e1911b1665402e2563d5759ca SHA-1: 5fe70d58186c9227e614bbc2fb35b0e89df4dfe6 SHA-256: d6e3689a58ba921c72706251a5cabf3852a1e44b460037e6cdbfba524b902144
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vrakskodamnetice.cz/file/tasajipumogi.pdf In PDF document text
    • http://gold-carsales.com/js/upload/files/41856171380.pdfIn PDF document text
    • http://air-con.ru/upload/files/kenisowajovut.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/donuxijisigedebikuzugeno.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zepuletofovupedobaba.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kapudiw.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94030560119.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/61549898084.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/sekujizanavumuzurufozaf.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/16174407177.pdfIn PDF document text
    • https://begili.com/uploads/image/files/48164072853.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b404187f0---23831486235.pdfIn PDF document text
    • https://cardolf.ro/files/85896819072.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/92527208491.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kekekemisifawikisixi.pdfIn PDF document text
    • http://gabortech.com/admin/file/50105561927.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/gadugisakavidipanu.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zunutisalim.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/tepefubovevonefapapilik.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vewupolezekexobabomajelor.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/35854811996.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bruut6mfho77qiohc12ki7r025/84940583393.pdfIn PDF document text
    • https://cape-electronics.com/media/file/88063104840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=melhores+players+de+video+androidPDF 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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 18640 bytes
SHA-256: 78550cb65a0d4e80b3df806e400693927ff960ceca2ee84878e88e33afd57e17
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10564 bytes
SHA-256: 6caeab5a501f07694615ca41d50484a59e9d8980ba5754f5000fc0c854bef39b

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