Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae3f28694453e72…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 21:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61577e92952344f6fbe628c5779a6996 SHA-1: 27d40befe010eff9f2e408ece465ffaed28c7ae4 SHA-256: bae3f28694453e725838054c0f7fdf3f8323eeb15b833180eb543998498dea67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=stewart+early+transcendentals+pdf PDF link annotation
    • http://xn--h1acbpobggs.xn--p1ai/data/files/mibugukedokaxelumuwilo.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/96129594774.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizimisiwuxudosobaxepe.pdfIn PDF document text
    • http://stefani.cz/fck/file/73719976378.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/90371739036.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nelabuxivekesa.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/64499067857.pdfIn PDF document text
    • https://nevisnews.com/userfiles/sudevak.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/77186623817.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/48511586249.pdfIn PDF document text
    • https://kopari.hu/files/file/tevoxepaxebalufimivebimi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/51480300638.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/27454365410.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/wesagajotuw.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/kodopifolekekesolerikaba.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/sexuxajewajemubinoposu.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/71446495873.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/sixego.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e2487da0---piwilamuvewudaradojunova.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/fabed.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a29e6ccfa7---venevafonedo.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/tomatikegumuranulugixuw.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/25361274663.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/takumewixadatenifolumuwo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/36980615648.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/detodopufejodedizagu.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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 15564 bytes
SHA-256: 1350fbbbc08214ece2af6b9b5967ced5529e371145d77f9112fcd02e085dacb1
font_02_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10676 bytes
SHA-256: 85d58791477801f73b939f49ef50ff9a029308efec8c545a05f8841e50bd74f3