Malicious PDF — malware analysis report

Static analysis result for SHA-256 716545cc0c398cd3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61a5cf78e89e228a0d43c8a3df64b6ff SHA-1: 829911de0b32cd710ea3a5e3f5204d39c3e3d730 SHA-256: 716545cc0c398cd3cad07f70108dcaf9bb55a7b35fda9a49a9cbfb2078e6798c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. One heuristic specifically identified the PDF as a link farm on disposable hosting, with a UTM term redirector, likely to obscure the final destination or to promote specific content like 'youtube downloader app'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pametnidom.hr/pametne_kuce/userfiles/file/tobelos.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/664239546.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/96379013132.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/noweniduwulozesaxiv.pdfIn PDF document text
    • http://client.diffuse.info/files/45431970769.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lofisigoxivunakevujanapu.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/93652474833.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jadidakapovizoxujox.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/dikosumijev.pdfIn PDF document text
    • http://only-svet.ru/upload/files/96393244965.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l182go6lisph9ipc0j0jrqh0t4/nafofikowatefim.pdfIn PDF document text
    • http://haki.vn/uploads/files/fukinarizod.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/runuzuxuvezur.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/xekerepi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73a35f4ea---14675678459.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100824188787.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/jixar.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/41140558031.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/sabozob.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/segafubixeteriredakejaf.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/81147270435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=youtube+downloader+app+download+freePDF 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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 16824 bytes
SHA-256: 3d4cd55a29de234c172d0eb1e0124e3b86bda7301d7f31722a7821c5d3b4349c
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 10540 bytes
SHA-256: 7b5f44f97155b611107035a47e9c89d0a79aac39192046f6b4a6beb877237a03
font_02_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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