Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5804c10b62b917…

MALICIOUS

PDF

68.1 KB Created: 2021-09-12 05:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 718d954507ae99f01086b86d20c1a889 SHA-1: 26ab6a744ddcb29f19f55cb40062e46a7d02eff6 SHA-256: 9a5804c10b62b917da1a467245716c87cca27f47b4169f2b71443c28ba49e920
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the PDF for containing many links on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://av72-reklama.ru/userfiles/file/163099869392539a5492fe6ef1e737.pdf In PDF document text
    • https://ngusacdon.com/upload/files/64655134914.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/lavulelemibuja.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/ziwomosusi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/89350105215.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/24052063761.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/kazunito.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jisolovepotupadu.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/kifafojexazo.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/22986692349.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/movufoveman.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/24502278398.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/junape.pdfIn PDF document text
    • http://saktigroup.in/uploads/keweta.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/ratiroponumewuwasoliwogax.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/reteweziw.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sunaxiragilanasowovajelel.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c1fee19d---25813308044.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae81b7343---74422676281.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/63476923325.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fapetovowomigusezarizizir.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gaxewexem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+vm+downloadPDF 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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 14876 bytes
SHA-256: abe6703c07ce202b7d2ecce627a5be9fe69761bfc331f9706cb7c834efa12be1
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10144 bytes
SHA-256: 59e395be7085d54350ff542898ad40361cf4d442cad8f6199cf4d246b06aca5f
font_02_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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