Malicious PDF — malware analysis report

Static analysis result for SHA-256 9367b433cff94cc5…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 12:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d58ba8cc110e326fcff31dba076fc4c SHA-1: 2dfd0397cdfc9a34c54e629c65d434614a345911 SHA-256: 9367b433cff94cc53a25aed665c7f812a8a0fa8ad0d4814522c6d7a0bb39c597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection point to malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/putilukuzomamaxafi.pdf In PDF document text
    • http://birdwatching.sk/media/file/vipisisapobotexos.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/givajikepitobodo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/bibolater.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/200726886.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/bebexudopama.pdfIn PDF document text
    • http://le383.com/uploads/files/kokimopunobasegekem.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/70790628711.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/59163472973.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/notalizabupimokedexugogir.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/51478139741.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/92046561564.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50127221442.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a240178474---ruxenidu.pdfIn PDF document text
    • http://snft.ro/media/file/60993150898.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/boxiwapudomuzibu.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/45768836514.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/12940566914.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/78838605030.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653a5719b0---68762932075.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20210923010323.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021101859539620.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/98633700109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sustainability+in+oil+and+gas+industry+pdfPDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 17320 bytes
SHA-256: a933f742e177fae7414a7d9e9174a7986ea7a523f70c33b42cf0aa5b2c760563
font_01_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10972 bytes
SHA-256: e614ae09bf5559f8e0786d6d79df56ad756ac27d072a26e2cf9128e1e1db3415

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