Malicious PDF — malware analysis report

Static analysis result for SHA-256 522239d7ecf803c7…

MALICIOUS

PDF

88.5 KB Created: 2021-09-13 13:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ce5845e56f4c411f05effd43e846662a SHA-1: 6ca552d871cc3e660a131e41b5c7de4269e2f9e1 SHA-256: 522239d7ecf803c7d8d6e6b63a5d4a91396ca15afef7085ee4326e12ccc28ac8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://www.ventisilva.com.br/ckfinder/userfiles/files/42581750913.pdf In PDF document text
    • http://kashima.cc/userfiles/file/ludosoriwuzun.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32e93248d---jopojusizitibisun.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/mukudasorakuferegovexefi.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/nulobaruwomisujad.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/25307833275.pdfIn PDF document text
    • https://auto826.com/uploads/files/guzozewudapexazapa.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/noravapog.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/67205514238.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/39407994182.pdfIn PDF document text
    • http://chongros.com/userData/board/file/bazomegavuzawusenimore.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/89431080774.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/26340813405.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/tenukipilo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwadubatageborof.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210907154833.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xipimulefijafow.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/84146688530.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30650246417.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/zabexukade.pdfIn PDF document text
    • http://inistor.com/ufiles/files/kawabixi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l8fkrm06pfhpj08ejfh9k3n3gn/94778649417.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/bakawikomogom.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/giwinakejisifuzidudit.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/liporavusiparevimodiret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stick+it+movie+streamingPDF 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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 18048 bytes
SHA-256: 3bae4ca66e56fe9fa84c38fcd124c92410e431dbeb11f454fbd871b130a13274
font_01_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10760 bytes
SHA-256: d92f6c9abdf4fae02666533219658dbf15a8ec9780b7e2a71e5b9930929cdbae
font_02_sfnt_off00013c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1