Malicious PDF — malware analysis report

Static analysis result for SHA-256 310845ca4673d842…

MALICIOUS

PDF

93.1 KB Created: 2021-09-17 03:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 210ce5f7d061db59be18c65c22e90756 SHA-1: fd6c54bde767a6ba84a88cb8307b13185c5d167b SHA-256: 310845ca4673d8429d6102fa80327f27acaeb3c5290c6d7b2f84e640a0f313d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=you+are+my+everything+lyrics+gospel PDF link annotation
    • http://fueandhair.com/userfiles/files/petovemuwuzibawuseruva.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rolarukinu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gedovosovumiwokitope.pdfIn PDF document text
    • https://pellevah.com/upload/files/71695814445.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/fuwaxakobuku.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/16604286251.pdfIn PDF document text
    • https://atiksigorta.com/files/jefalujeli.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63559433348.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/32903901846.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/pikadiseb.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/45846008074.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/25072779833.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/rowiwumujinod.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rokekeloderoxig.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovovemapebukedo.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/6184732765.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b22b6572bb17041dc7924bcbc77b5b3b/kukavolaxidawewus.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_000953_147.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912044245_24uthu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/dijewijanovekumulefarutut.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/22489074340.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/xaxusebajijomelat.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/soxisalemeledixuwaveboka.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_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11084 bytes
SHA-256: 825649c62df467331f93d9e948417fa7c91d39caeaee4d3f907ee430b668a5ac
font_01_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 19136 bytes
SHA-256: 90418b6013a3abe00fa521550eb593620af1327607c5d98f9c114ea5b29f24f0
font_02_sfnt_off00014e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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