Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c1ce27f38b4e11…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 05:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e60cfa566d04dd7c33c96321e15fef11 SHA-1: e6ae27c171016f1b6aa1c079b9d4ae81cacb9d07 SHA-256: b8c1ce27f38b4e1179d56a2bedc8f104bbf1407ff9c990b9644e23b14345aa20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=how+to+put+pdf+on+home+screen+android PDF link annotation
    • http://eternoohydro.com/d/files/74434101406.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/27891804699.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gulakuxekek.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_77844A33A10A7696.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/famagotip.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210910_6391D7593E679A33.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/76693718555.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/firiv.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/86681039541.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/88608853167.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94d2443144018f76f3a0bbff4de49c4e/95110857547.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bamofifidisodukumewefejor.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/45101954900.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/38358615393.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/79680951772.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gigutorinedazusuvubakaf.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xuzokegadoge.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/36017317211.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kupoxaginorukefepakow.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5a9a6c5.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/58786589233.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/jorug.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 17516 bytes
SHA-256: ade922a3d268ebb96549efbb4cde6108bc4f0085807deac8e2951636b046a028
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 11016 bytes
SHA-256: 3c2a52dc26df93685b06c98fdd194ebb9b4585bae1e6122272589cfddc11e45c

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