Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9b406f34972f7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 20:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6731d743171a5e80cc5b046bbd077fb8 SHA-1: fc4ecfa0e4c463c8fb4c10eb5873641c0c842f66 SHA-256: 9da9b406f34972f7d3bf50b95d5e114652d1f27f29041ac6b412bd9f20b08834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=the+walking+dead+season+10+episode+13+full+episode PDF link annotation
    • https://maria-galland.ru/files/file/folexevizekajezumop.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/19718656484.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/20406919046.pdfIn PDF document text
    • https://windsbs.biz/files/file/95603635046.pdfIn PDF document text
    • http://tcihk.com/userfiles/tefudegisalasewamuto.pdfIn PDF document text
    • http://knipia.com/userfiles/file/mupexid.pdfIn PDF document text
    • http://consade.com/userfiles/file/78687579604.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/getivamefasimujabixigal.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109082352209391.pdfIn PDF document text
    • https://moolans.com/uploads/files/romaxak.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/rodukumajaf.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/dufokuvug.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/10093681492.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/dituxebafemuvorozo.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/72848664556.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/goxeluvef.pdfIn PDF document text
    • https://phr4u.com/files/28754064291.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219151754423080.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sifajofigimizeberem.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a331e0d7---40489684127.pdfIn PDF document text
    • http://findusafranchise.com/files/files/zimiwonasaxekebawebomadut.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuver.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tenojoja.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/10745803444.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/duzonupugufubanapikunulak.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 11164 bytes
SHA-256: 0cd8faaa27d5b8481d4d333a6fa18d7789b5339fab08cd9e8e1e2e0bfe06a617
font_02_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17604 bytes
SHA-256: 2510cad0752fd185e804930d4de78c5b570548d54c12a74d529a48132ffbb2df

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