Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8224c00c885de8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 04:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6da9c34e9e73b3b12473e809d1c0ef26 SHA-1: 5f100d7ff7c9531ebc3d568261b820e6f9307c6b SHA-256: bd8224c00c885de885afe25313da612a34f4588cb78befcf792ba5d937667667
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=pet+b1+practice+test+pdf PDF link annotation
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/31082367956.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/43580823112.pdfIn PDF document text
    • https://almavilag.hu/files/files/56112490778.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/14614311288.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/sokejuwefimed.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907025755.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1aefae698c79d099de2be9d7eb5bb7c8/27581172934.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/47412464612.pdfIn PDF document text
    • https://llc-sahara.com/site/files/rimewevofew.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/76090917736.pdfIn PDF document text
    • http://bienbao.net/uploads/files/vapez.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/16293404906.pdfIn PDF document text
    • https://jetaime-shop.com/files/22274142429.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/resarilefijuxevaxonaku.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/velaxawubolekutojanapilag.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/83099590886.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/sikupu.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/8147859249.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61370d32569b3.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/52199100727.pdfIn PDF document text
    • http://net-work.cz/data/file/30548389625.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/pavejabozufikugemabu.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/11317236705.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219141148114046.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/litivozobemevavusosif.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_off0000c0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 10536 bytes
SHA-256: 55e1dc8d006ba0992d84a9aa6ce9ed44ed0e04df1796750328881fa86abf6d24
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 17100 bytes
SHA-256: dcc1000b3b7aae9b74903a2e76301583ebce74d7cc578e505fdfeb9d213fe9dd
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1