Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcfb5bbce872162…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 12:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f72dd7b30df3db13fcbba2637a33062d SHA-1: a4621c3b0907ed151ef98dc56158f7886a381856 SHA-256: 5dcfb5bbce8721625b45faf3e43f7135cf59e173044af1972de4f2301861adae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=subversion+download+android PDF link annotation
    • http://debandhelder.nl/ckfinder/userfiles/files/81669152786.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/16477271239.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/5689881028.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/89647759523.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/banazodenuma.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/subipewujokakip.pdfIn PDF document text
    • http://leruichem.com/upload/files/lijuwunitabajog.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/78983682444.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/sapesobokonukurijokegofis.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/buwevazologulusoxamifu.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/94082054774.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109090719232098.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/64522285432.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/16893425801.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/kiduwutaf.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131c163f0cf0---67462053379.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/vapevu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sotiwozebazarosotajepuza.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tovibalu.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/fanafarojaxezal.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xofugab.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sagititegivugomijijewip.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/10668683570.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a90b2286---2398359381.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/raxogaferani.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_off0000b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 14392 bytes
SHA-256: 295756bce7fe1ab2272e3883518a458ac3f6dd2be1231e317c53d7c919a817f1
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 10612 bytes
SHA-256: d12ba24f55673ca3e2acaee289d8fd4e89904dd8feff61fab094c67a1bab9430
font_02_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1