Malicious PDF — malware analysis report

Static analysis result for SHA-256 2888dd9ce44704f3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 05:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5dd60972383ae5b4818f1ec6c0ca228 SHA-1: 63d1f8d89db454886429ec95af7e0d539a3124ae SHA-256: 2888dd9ce44704f3d1f1f3d5948ccb1c019c4529e5cdb3ee11616e25349b4660
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://satisfytech.com/ck/upload/files/vizowega.pdf In PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/68216906363.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/4656879491.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimexoluruzega.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xebamimifo.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/delumilekuwamupusakovu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/40865820567.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9a8eb4b7d47f6fa9c6fed47ba837eea8/vefatoweripimutawu.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/mixalol.pdfIn PDF document text
    • http://etkenkalip.com/files/38270779486.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/87238520322.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tevutozu.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10867379718.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/30913300579.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/xamakadatopixavakaj.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/82856274664.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/13595631342.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/7685204433.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/89015331626.pdfIn PDF document text
    • https://mashura.co/userfiles/files/16020507583.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vopunexabuxuv.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/gelepugironoxumapo.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/67757661936.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a0cbe734---bizag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=after+2019+yifyPDF 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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 17372 bytes
SHA-256: 3258585a4dbe1ef798fb4dde5accf9e04d9a0b2449a6eab6df01ac7e3070f334
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10164 bytes
SHA-256: 109d38d043547b62f6d1fe2cf62f0a0cf42e3b1a9b24c883f1a0bd497ff1ed72
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1