Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f0c30a721ff0ad…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 12:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36f64ee39a155070649d083a622773e1 SHA-1: 5fa07d31e6e43ea3c255d74cbff479fe0091703e SHA-256: 24f0c30a721ff0ad5d841f513cad4aecae998931915e347b9b0a1e33413caf22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kligi.viart.lt/ckfinder/userfiles/files/furesibapavusez.pdf
    • http://highlevel.pl/userfiles/file/nuseliwipupi.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/seguwuliba.pdf
    • https://drhuanghair.com/uploads/files/202109100109478277.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142959d3e344---14349583676.pdf
    • https://s-serviss.lv/userfiles/file/66776012131.pdf
    • http://hicoweld.com/shop/fck_file/file/22054394120.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/fimew.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bexobapulem.pdf
    • https://medsplus.us/admin/images/file/bufosuvijiwiwoje.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mewatabili.pdf
    • http://markasib.ru/ckfinder/userfiles/files/20407019139.pdf
    • https://arte-salon.ru/upload_picture/1593721104.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/77580174843.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/91105672748.pdf
    • https://salvatoredivilio.it/userfiles/file/40205985722.pdf
    • https://uangraja.com/contents/files/5516569273.pdf
    • https://consurs.ro/ckfinder/userfiles/files/4450412847.pdf
    • https://thefertilizerequipment.com/d/files/86724624448.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e395a19bcd---beraleduze.pdf
    • http://educasters.co/ckfinder/userfiles/files/lufibidepoxotowoz.pdf
    • http://ppogrimall.com/upload/editor_image/file/33636810676.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/83746351697.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=good+adjectives+that+start+with+r
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdac.bin
0e813066b13e3b73526abe97a7aa2dfb31bea054436fd2da53558e95ff418a80
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 10640 bytes
font_01_sfnt_off0000d63b.bin
ee060a21ed9032372017db79490cab7d3ca42df57b30a90fc2132aba59a0e1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 16616 bytes
font_02_sfnt_off00010090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes