Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e241e559011af9…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 11:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aab8aa307a801a58135d875daa0f5c95 SHA-1: 4e3947cccb189fcd96837dc5fc0b2b3b24298c2f SHA-256: c2e241e559011af99d75d1f53e618df886431b14df412cb05b7feaf22d00a1f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, including one that appears to be a redirector with UTM parameters, and another that hosts a PDF. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=ben+10+triple+pack+rom PDF link annotation
    • http://bighost.vn/uploads/userfiles/file/lukigorisofamodexumadafo.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/muzevupo.pdfIn PDF document text
    • https://www.confirmedtour.com/files/41603883787.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/19312215690.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090515075761.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/60082571058.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/nugoxibe.pdfIn PDF document text
    • http://retailcop.ca/files/64483049682.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/zutokonugikikidokur.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903195032_ijpjtz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ad6e9730---17666608185.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/35710225160.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/bobajasufomaj.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/mebilejis.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/76230856002.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_7AFF565CAA274F32.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/20575937068.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/97516534587.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duxumeka.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/61869935181.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/keliluwatigumufotukal.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/gebexubu.pdfIn PDF document text
    • http://art-ball.net/files/file/63669138427.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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 10684 bytes
SHA-256: f99f8ecad29fee9ccf51ad1bb467a0601135167705c70be71ac9279d902c8243
font_01_sfnt_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 15880 bytes
SHA-256: 807270666f6b576d4dc6985b698fd5b65d5e8741040261a81306645a2c7c6753
font_02_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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