Malicious PDF — malware analysis report

Static analysis result for SHA-256 f796a347e27bd757…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 23:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70ee0d47ed0ba062a272938eeb586de8 SHA-1: 0c57db0787724b4098bbfb989d94f5d9baf6c674 SHA-256: f796a347e27bd757abd3648f7eb8ce847856fa6040028a3acd786183b491ad11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable or unknown domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://activsport.ro/userfiles/file/duvizadofulatavivel.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89835481136.pdfIn PDF document text
    • http://sokolzgierz.pl/web/uploads/files/70463662585.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/6494873482.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rusowiboziludede.pdfIn PDF document text
    • http://poliinc.com/upload/files/58511922876.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/30169566871.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d73590b3---tugerajodotuderupu.pdfIn PDF document text
    • http://marine-inox.com/i/File/47037227269.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/2054570441.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/47028962905.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jiwasoxo.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/tereja.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://1carl.com/userfiles/file/netazolimosisavopim.pdfIn PDF document text
    • https://hgb.se/filer/file/5992400823.pdfIn PDF document text
    • http://abwrva.com/uploads/files/98017747436.pdfIn PDF document text
    • https://onlinendttraining.net/files/bidikopujevowedix.pdfIn PDF document text
    • https://palet-school.com/files/files/nosuxemotedijuridiv.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95153725439.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/80120891688.pdfIn PDF document text
    • http://findacommodity.com/upload/file/8958691133.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/30365807978.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/94220635883.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r38mq2qqk6ulkpbp19ul05uvaf/92333145701.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/pexanovodipigukawuwama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=homeopathic+medicine+for+high+cholesterol+and+triglyceridesPDF 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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 11172 bytes
SHA-256: 19265c6bd05170cbc5ede490a6a440e2544cc219e2b0fe4b61590da72c038d86
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 19452 bytes
SHA-256: 4c2efbdadb301cd678847df4550594b4d05c451908ce1448e175c1eab242d7ab