Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d34a140d154e01…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 07:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fcbfd97063a8bad2acf7831fd15d0ea SHA-1: 9815e3fc13723e6c1ea6ec6303db3c956ddb13d5 SHA-256: b7d34a140d154e01ff2bdc6305fbe4b1484898d3d957b22f3dd219eda57c080b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the nature of the URLs suggest the PDF's primary function is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=master+2016+tamilyogi PDF link annotation
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fowememubupujosubu.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/temoridok.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/20995546362.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/99500371920.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/44290366172.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/41091098300.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/zadenuvivadofota.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210913212837.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/91344854247.pdfIn PDF document text
    • http://bushurov.ru/images/files/wifasun.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/nuvebu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/pixazat.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/84795681623.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447f276f41a---5792912246.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161421b63d4514---tesumikuj.pdfIn PDF document text
    • http://balone.net/_upload/file///vadulagewitonores.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/9411808089.pdfIn PDF document text
    • https://avflash.nl/upload/files/fotuxurovukagevu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/69305793336.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/delejezerukelijelusa.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/monekivibabugo.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/mutiv.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/63064614770.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/17004398626.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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 15880 bytes
SHA-256: f88ddbe9fcd8fdf4004b21201ddd744641b8b2788b3a8838a542aabc8991375d
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10916 bytes
SHA-256: 98a297463efae1a7e9c192e9121929e6e89a37182f37a1bfdd2d9d6aaaecc785