Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b77cd4fa8d857b8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 05:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b40e403ebd4dc876d7f66b462d1b52a0 SHA-1: 3b406203aa3f21591a894c518c319c581956b268 SHA-256: 9b77cd4fa8d857b8884b2e1bd236b8d9b6ad954b5be77257bcb26022fa67fef5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=stream+life+size+movie PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a2c98319---28048192071.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31435706363.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/75324907705.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/watevilafom.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/topazudasowagavokopatimif.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/2925526572.pdfIn PDF document text
    • https://trystsalonri.com/images/file/nawasedijab.pdfIn PDF document text
    • http://hanauhrova.cz/files/63013958312.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/55503204440.pdfIn PDF document text
    • http://badgerhillfarm.uk/detevoxonugapafipek.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/14242732598.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/gifazexabomusumimurir.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nakorefibonu.pdfIn PDF document text
    • https://electroagro.es/pub/files/bipodaxiwe.pdfIn PDF document text
    • http://asja.ua/userfiles/file/21537371761.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/73941518380.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/dozixugutupevik.pdfIn PDF document text
    • https://tch.lu/files/files/gavijebelemidobifafifud.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/31900270893.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/13324677368.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/wewor.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/46820701217.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxokilaromojawega.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/61539555770.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_off0000c405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 17156 bytes
SHA-256: 7ec00aee76b0f11c394dcdc8d117d00e0328c6ea23eab2f30612f476f0937eeb
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10472 bytes
SHA-256: e8fea19f7dac18cdcf5cb3ae22384f369fc83700be8ed2aeba740841467b77ee

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