Malicious PDF — malware analysis report

Static analysis result for SHA-256 5941f70ea2d55811…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 21:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f427c7bafdfea4ad17af3e3d55682a0 SHA-1: ed52782a9faeb2b4b4bdf04bb57e84ec96231735 SHA-256: 5941f70ea2d558111db877c1a2a66a053dcff26defe51a6e4760af56ca801c50
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs and the PDF's structure suggest an attempt to direct users to potentially malicious or phishing content. No scripts were extracted, but the overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fainitelecommunication.com/public/editorfiles/file/81611384563.pdf In PDF document text
    • http://ellev.fr/upload/files/fibiwumatunupipug.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/58723048296.pdfIn PDF document text
    • http://santeh.md/img/files/ririxemurabizinebo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/47859227979.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/73421691417.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_234508.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/65920349333.pdfIn PDF document text
    • https://music-group-store.com/upload/files/49420044743.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/wixaru.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/9220937452.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/db71139fa6c185fafc57a3346d3d669d/lowuxevili.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/67013828571.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29988617775.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646375c1e3---megaxote.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/megisepimajo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wenewowoxatususejafefivap.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/wipavonubevujekujawotus.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210917011021.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/bubegiva.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ditebusawozawefivaka.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/40597255964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+job+depthPDF 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_off0000bd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9C 17040 bytes
SHA-256: 255230a368f829e5c017b377ba1f7a577a8919ecf5c76a27272e4fb67394c2a6
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10504 bytes
SHA-256: c3384ae9148d7bae7dab482f6adc3adc8331d65465e5dec6e408ad24078df35c

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