Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c61911a68947ade…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92a54bf86453326752029f3fab5de86b SHA-1: f92837685c248497efce709bb3f938a48d176406 SHA-256: 0c61911a68947adeb2093b4eccc19cffd46af7eb60367e468d54112d4ea34e2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to potentially compromised or malicious domains, supports this. The primary attack pattern involves directing users to external resources, likely for phishing or further malware delivery.

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 http://innotack.com/userfiles/files/71811350928.pdf In PDF document text
    • https://biroestarsa.hu/uploads/file/gefezepadewozovadetav.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/sufupaguxol.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/rubak.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/lixiruf.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kulavu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/5224247526.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/35499510735.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/95788780405.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/wurunorukifetobibomaxasi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26263df2---86810634782.pdfIn PDF document text
    • http://trieuduong.com/images/Download/topozewonivajaxotav.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/surureziwira.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/sepopuzi.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/xiduwawotigagujoruvanitax.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/mapotisudokelu.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/fofezetakuwugin.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/3926522676.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/rikisex.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23546707012.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/kftg1kufni2hrjgq3rtoc6sfcmqkqap9/wurinonuwibupo.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/dodipepujujapu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/sopewifajenabu.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/xodebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=words+starting+with+p+and+ending+with+yPDF 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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 18844 bytes
SHA-256: 133ca9a39227f5468317c4611c46c093c4b9852f8219be129f836666e74f8bd1
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 10816 bytes
SHA-256: 305ca025d2bbc16b4320cac563e39248e79e1fcab4e45b980987433fb591214c
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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