Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df1464611dc44f3…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 17:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae7ee16df0be5cd244fbdba4a941ac85 SHA-1: c2ed9f78b9d0ad85e830eb90f31815baab09ac48 SHA-256: 6df1464611dc44f315bc0b1082ed80eac29f9b89ab0aa8f225fc868aa465a9fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=miller+the+magical+number+seven+plus+or+minus+two+pdf PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387499c894d---welidoson.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/73622665363.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/42092468856.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gunisesuluweju.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/91974444924.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/99617485800.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/12445407427.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/48695490714.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/53839490787.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/64839832470.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/26641732295.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/defesixafuvetogigozenen.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/sedagefomexozofiliwomi.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/28266729163.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/vazagulufidawi.pdfIn PDF document text
    • http://aminotp.com/upload/files/28655165670.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/72538586447.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/vugedotosazut.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/todepazone.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/kirabamegupejavadifa.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/buketamumirubo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161320e379791e---vikuxoroxawebiwe.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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 19048 bytes
SHA-256: 9f19233f0af5b72c1a1cc02ce1f65ba61c9ace5ac4e3a2bc2e622c31cdc6c0d3
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 11452 bytes
SHA-256: f069efb07fe8cb702bbe4d2d903f2092e59a6c98d3e5003708d8419a18acac1a
font_02_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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