Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0f7583b263ef58…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 16:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1426a76b320f449f337de70ed1452f0c SHA-1: b1c133a4d2c8e16e5a0c1cf61c9760539f33aa4b SHA-256: 8c0f7583b263ef58f0fbf28274850f6850baef6d98f7ed3f4d142ac4f334bd64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful websites.

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://pixomot.ru/uplcv?utm_term=stranger+things+watch+online PDF link annotation
    • http://innovad-ltd.com/userfiles/file/74593628125.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/vizegekifaxezotozezewag.pdfIn PDF document text
    • http://js-space.de/userfiles/file/vonixirujagika.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/8231996075.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/84470205269.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/52089401840.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/p5fc4epheenfjudmpbmkg8oki0/9738166670.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zigogaki.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/32490585160.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/76627492468.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/13387876639.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/88847073124.pdfIn PDF document text
    • http://mopron.ru/upload/files/10929790797.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ef5e40fd---sufegate.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/84532840461.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61566867639.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/45569005399.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/bekelevur.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/90364997365.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/13697105424.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/xuzeperuvisitu.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/21446889687.pdfIn PDF document text
    • http://halanmilk.com/upload/files/vumalutulivuduwijupawog.pdfIn PDF document text
    • https://upaspor.com/resimler/files/topom.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/rujemuzefezedibuj.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d0vuf9ckk5pjpp9qj1b66nnkr5/28883041791.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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 10672 bytes
SHA-256: 9e8da60f89973315d23e6f3f51239164596c559c892421c9399c76fa702ff288
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 17988 bytes
SHA-256: 6b8e84eed15a932ad17aa292fa4e32128b5728ae3612bf967e69881d5049113a
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1