Malicious PDF — malware analysis report

Static analysis result for SHA-256 529bc6d621ae76c6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56f105c98377acabcaaba7c8fdb96fdb SHA-1: 629047d9dc431ca79317f60bf15bb90a297bb738 SHA-256: 529bc6d621ae76c6e9e258437d41288621c84c9b2b9126151f85270b4ecf9f83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or scam campaign aiming to distribute further malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sofupingame.com/calisma2/files/uploads/baterimotowalolawomuv.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f97tf5pvqbsa2tmcmcb8gv5626/83899714533.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/ginolunopopafojekumajip.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/98637511974.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912033253792264.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/ferikejovubiwujeb.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/96839812958.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/64288840389.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/30776674921.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/5176935700.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/7043573311.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/91936538422.pdfIn PDF document text
    • https://people11people.com/uploads/File/94268423992.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/timozatawajipazuxes.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadb86587a---7584679587.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/6713595411.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/31579631538.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24573561544.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pagezirenu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/7850341672.pdfIn PDF document text
    • https://zhansq.cn/upload/file/waxiliraguwonufikafij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+reader+for+mac+free+downloadPDF 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_off0000b79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10368 bytes
SHA-256: a4cb6637bda9b49592c98b4f9435c103ca2a4aff69b0ac9898959479afd5d716
font_02_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16860 bytes
SHA-256: 284fc7563aa16e4d51f3d189d34d8ab4f466db6c4048f2dcdd4461051f7aeb9c