Malicious PDF — malware analysis report

Static analysis result for SHA-256 530a052b9255f472…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 23:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: acf34d2dd151a4715e41dd2c7bfd8572 SHA-1: 4dc14b0944e0be08e007d157adf2641c9165adaa SHA-256: 530a052b9255f472de7887f82aa394eca0028709a14e39503fbf4022c2d8c680
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to execute further malicious actions or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://299-45.com/CKEdit/upload/files/tiwakudat.pdf In PDF document text
    • http://jsjxh.org/filespath/files/20210901150526.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/6722999208.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/waxetaradisumozudimebi.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/lekedi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/11120103175.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/61423376140.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210904105728.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/61581356445.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/sirejawuwolodotizologur.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/22520166695.pdfIn PDF document text
    • http://18554080.com/userfiles/file/60863239249.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/roxezamukuw.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/39031729842.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/93412034304.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45467658582.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mamopof.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/5262357064.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/benaludexejelufaku.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8695673558.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/68364490643.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/xagikuwituni.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec45508a3---podesisutoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kotlin+best+idePDF link annotation
    • 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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 17324 bytes
SHA-256: 3286d1f62885a233a66b539b69ae551bfdb3368ad354a270a43b8edcdea1609e
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10112 bytes
SHA-256: f0390a3d324ca2054353d8bc29438ddef2bce6a9157c4ae2e3c150480be3f833
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1