Malicious PDF — malware analysis report

Static analysis result for SHA-256 236d8f5958871116…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 12:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25af6177dc715ab7577a4257ac406813 SHA-1: 4961fe7b45428fad37c34e6272cd7197ce9de565 SHA-256: 236d8f5958871116c7e87293a8f12856723c1b95e2f04adcc9ed5fce7d34c32b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/96438676861.pdf In PDF document text
    • https://nabil-doukali.com/userfiles/file/lexopekamuzunul.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/71648332745.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38432757090.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/33686407564.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210913012928.pdfIn PDF document text
    • http://evola.it/userfiles/files/sukevijawubakonunurisunu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/69474622553.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/80489053398.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/putuwew.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63837455735.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/gasimavenix.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kanekasibedumugos.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/92803334623.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/tijilemonegufisigunato.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/44661679806.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dutokimodegawifedewewom.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_223508.pdfIn PDF document text
    • http://asvpp.fr/pdf/renisedujefabotewokona.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at8qta0qivd0v05147aatbkdn0/vaxonasifukurenideg.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040ebaf448---xemonezufixokurimuzuwuwed.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/mebekuxuzowa.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mepajenegepa.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/pejasobolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=maze+runner+3+torrent+downloadPDF 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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10392 bytes
SHA-256: 6a4ff8d15faa6b035e08c36c0e96cfb4de77d2e92c95b75a228a35095b569e59
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 17876 bytes
SHA-256: e6ca2a1c6f6c6de51ed260abd6780e68c0290881e972011d3a4438ae80bdcd71