Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89d8347d0e03d58…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 18:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d781f5269bd742fb0055e5c86d7df04 SHA-1: 83a50c38ff244a91a695628211a7b8b734572a99 SHA-256: f89d8347d0e03d589f9abd0cf555e7130bc0fe883af7594867c71fd217d9c818
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links suggests a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=bubble+witch+saga+3+mod+apk+unlimited+moves PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/57589567989.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/subajujigojixiruzifo.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/soxamaxesefibezawelamuw.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/19405858821.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/sobevaju.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/45052603857.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/86718690053.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/72878228960.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/23173382360.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/kuvozetobekinokewiw.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/puvuguvifozem.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/tefumekexaxujogusizetak.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/80452656521.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/natoriborimoxalabamib.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/16188132536.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f822d45255e4324b2e06dbee42911c42/rimufefopurod.pdfIn PDF document text
    • http://faradbox.pl/files/file/ronizilal.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/17300970335.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/rizafogiripezisolavakuwe.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/51795034452.pdfIn PDF document text
    • http://01host.ru/userfiles/files/sebinegizezelibib.pdfIn PDF document text
    • http://myphamasia.net/upload/files/62235642220.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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 17648 bytes
SHA-256: 1c71f3c9d7eccf49ff9aaf1a2eba51a68889112bf4d280cab1ebe769a3c35bdc
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11568 bytes
SHA-256: b5800599a7ed940e3166d470497ec83eb53f91366c26220cdb1a1f7f0b663775
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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