Malicious PDF — malware analysis report

Static analysis result for SHA-256 da575c6597ab9f6a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a6f4a3dd497606e00b4d49865cb99dd SHA-1: 1cc8d3f4496f8acbbc1b38fb05754fcdacf57f23 SHA-256: da575c6597ab9f6a2ce6d55aa26e168672cd70bb19e5b168c39f839fdf2e7d5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URLs, many of which appear to be part of a link farm, suggesting an attempt to manipulate search engine results or host malicious content. The presence of a 'download button' heuristic and ML classification strongly indicates malicious intent, likely to trick users into downloading further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=krunker+auto+aim PDF link annotation
    • https://etonbio.com/newsLetters/images/file/1467240524.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/bubikemikojuzobutonukome.pdfIn PDF document text
    • https://swiz.eu/files/editor/labojakejanakafiburivaji.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/51429643174.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/jatenalafevanopokuza.pdfIn PDF document text
    • http://jsdarvin.com/files/64369241007.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7fb5ce66d---6487758151.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/89933226361.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/wuvofukin.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sefivo.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/jiwunigozi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/togowekobinuzijupugidoz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614818a5ddd2e---mijukavi.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/6565130230.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rexenebogewe.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/41652464288.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gawatazebikofokajo.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/3794008277.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dosigidir.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/jegusisiselosewuvidem.pdfIn PDF document text
    • http://kant21.com/userData/board/file/9006592331.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/segofuperiwokev.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/zitifusuriwul.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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 16076 bytes
SHA-256: c55c3693b9ae5d0bb06bfc2ebf79e68f5aa7c97f4e192d063c13875042c2e9cd
font_01_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10236 bytes
SHA-256: 52537b81d87e7995f8f0b61ac2b8b65e64c1c47f3f9de902ab310b93708506c1