Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9995fb6a16cdce…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 18:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a0a9a64d11db40599d230a23afae550 SHA-1: 48d2685c81b670699c9e48a3c1307b3e274d5f34 SHA-256: 4f9995fb6a16cdce8c7bf7e1a0a572d60806715c269a15321b553ec2c0accca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are structured as a link farm for downloading files, including movies. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the document context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=download+rustom+full+movie+hd+1080p PDF link annotation
    • https://takarasushimn.com/userfiles/files/14282708412.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/zepitijobotebizo.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/zupudojad.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/85809074699.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xekibo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4q5g6jkt29chi4vhvl9hh39gk3/79581300652.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/74839554405.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/5604435392.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/24532826299.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1d064776---31762688005.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/rudiwe.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/rolikakalubinunikufejude.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/juvofinuwupi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/badagisofasuselumaji.pdfIn PDF document text
    • http://ymmicro.com/files/files/nufedofusinaxuvaxolobomo.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/81542417795.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/69856000634.pdfIn PDF document text
    • http://melabo.com/upload/files/72330278498.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/52106673332.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210901160147.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/japofawazetupo.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/gazidadilosi.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/9107090199.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/68351605483.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901233213.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 17544 bytes
SHA-256: ee870b0abb113b4eb444196062f884a5439c636b72fb80b839592901b94b5a69
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 11396 bytes
SHA-256: cc2242d3b7561962d4b37a37ff7a6d11166eaf31943b45d818a5bac98d25ad5b
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1