Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e9fe54f17f4ccd…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 20:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cdbf8e7d4e9895e559a7a0aafac8d5a SHA-1: db670148c2881330468dde271e64e7027043a829 SHA-256: 08e9fe54f17f4ccd07ca99206f8ff3cd7bb4f0009fa1671aaab1a134d91363f9
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, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=world+bus+driving+simulator+hack+apk+download PDF link annotation
    • http://saharun.org/uploads/ckfinder/userfiles/files/tukosibamo.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/6247718944.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/93929964396.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/20535653037.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/73165966247.pdfIn PDF document text
    • https://mkontakt.com/dat/file/20024612054.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_6D9C2961E73BF9FC.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/83602397362.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vuwuvu.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jitesarofamipuxitapotu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a8ad0225---biketatojetidubusenone.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/fokixusogisokiw.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/16809620478.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/64869029575.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/78299027932.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13410298569.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2b23ff48---xosevitarikoxenokab.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/gofunex.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/vovopiwiwakakufikemesonog.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zavopovaxosevabigum.pdfIn PDF document text
    • https://unitjaya.com/contents/files/sugomosevifipesudafaxob.pdfIn PDF document text
    • http://compsult.net/userfiles/file/46526577619.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/tajixonilulafepe.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/zedadusa.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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 11308 bytes
SHA-256: a87161bd95c39086b25c39d82455c6bc3fb3bc7f1ec27abce61280588d80e759
font_02_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16368 bytes
SHA-256: 28202b6a4092f8af526ba57be13f11e7855750f7d3c246ec45b5aae76ad238cc