Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fbd8e480b5f20f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 05:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cdd14adf385f96ccb82eaf2cc9f28b4 SHA-1: 82deb6731b5e19442374c46df65228f01f731700 SHA-256: 41fbd8e480b5f20f49671baaf8c2ca70ce070c7a5e68cf0ccea25c4c21da1df0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=super+mario+bros+gb+rom PDF link annotation
    • https://solturism.ro/images/file/51475822745.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/rizifosiregefobazitor.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • http://acelybio.com/upload/files/zibutuf.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/66720320339.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/nizuwewududoja.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wilawidagijijuvupebaxa.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/vagixidasimogazomerus.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/90673056527.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109102358435075.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/gokufexojikafoxekikipevom.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/31052662795.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/89739308399.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613083214e814---57289320477.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/gifipo.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/53828460989.pdfIn PDF document text
    • http://northcity.rs/slike/files/43503233805.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/4674875273.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161404f6b88f97---4293491250.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/96720859460.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/76430929559.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/vofazigepofasetuful.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/94739851348.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vafipakigodiwebuvawixoji.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/92693414281.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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10664 bytes
SHA-256: 214aa258186253d5ab17008c413a1e5fcbca02d74a46896e73c603047eea8b46
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 18472 bytes
SHA-256: a06d4ffbd1345608efae86688021b6c2330da9b017d822b20b38938115dd4272