Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ae72864afc161b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 03:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d54c35254734af408e9bf9002ef2f04f SHA-1: e966980ff1babe375b70b9fe0d1d606083249518 SHA-256: c6ae72864afc161b306f47e0d2e149f51a939489a798f595fc359c464c61a6a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the classification as Pdf.Phishing.Trojan suggest the document is designed to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=how+to+merge+2+videos+on+android PDF link annotation
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fofagiribib.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/6252368040.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vasokinuril.pdfIn PDF document text
    • http://lagrupacio.cat/file/30433364914.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/92432311692.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/78017017228.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/99682511916.pdfIn PDF document text
    • http://naylorrealty.com/userfiles/file/jifefeverolaxejexixowul.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/zubakinafuweve.pdfIn PDF document text
    • http://carszana.com/image/upload/File/29167242781.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/45923068684.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///15064538319.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/6253072420.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wuxupi.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/57501047244.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/80891413889.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/xadukinubemev.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/rilizanibeforesebaxa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413f4c76e5---vunefusifawizonofajikiniv.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vowit.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55edee3f0---futizokutalijivozimano.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/74829957535.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/84314391860.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/kovod.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/tatajenawuju.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • 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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 15236 bytes
SHA-256: cfded72c791af65753078b69e303c0501f536814b863508e68fe4a86c82bc7c6
font_01_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10808 bytes
SHA-256: 92481ad64a92b6c615e028e5567a9fbc8b3ba84c1c342fe47cdf53f42096d3b6
font_02_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1