Malicious PDF — malware analysis report

Static analysis result for SHA-256 3751fa65cc224729…

MALICIOUS

PDF

65.6 KB Created: 2021-09-14 07:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66118900d42a1f3abaf5b04db2210ba8 SHA-1: 6feed531d7309dd7ceb1744bdb540b44ddbedce5 SHA-256: 3751fa65cc224729d28c6cf5cf0cd42caa08acc9e1840b518e2b0c88cb89a883
124 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a link farm designed to obscure the true destination. One of the embedded URLs, http://utcsp2.rustyramone.com/uploads/files/98982144506.pdf, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6306

Heuristics 4

  • 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
  • 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://utcsp2.rustyramone.com/uploads/files/98982144506.pdf
    • https://gilbertems.com/videos/file/92561256517.pdf
    • http://sieuthimaynhapkhau.com/upload/files/ririged.pdf
    • http://nasfthr.com/userfiles/file/mudobixalowajoradu.pdf
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/54351016486.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/kegipifofut.pdf
    • http://nova-auto.com/upload/mevemezilebag.pdf
    • https://yensaovinastar.com/media/files/suxolomeniju.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/12558597345.pdf
    • http://deaprogettazioni.it/userfiles/files/91933993917.pdf
    • http://tornyanggrace.com/upload/file/dubijikanu.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4d542a1c---53333793301.pdf
    • https://mgs-on-track.com/uploads/misc/files/bekunurowo.pdf
    • http://happyorderfood.com/uploads/files/1615025760.pdf
    • http://195exim.com/datas/files/lamevizuf.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/33591347528.pdf
    • http://orzo.cz/uploaded/files/73157495072.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/346707296.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/56641452190.pdf
    • https://shturnev.com/files/foFKED/file/xiselo.pdf
    • http://cafemsoffice.com/userfiles/files/38009303075.pdf
    • http://kimsanghun.com/upload/userfiles/file/20219512124659.pdf
    • http://agataklimowska.pl/userfiles/file/63076519811.pdf
    • http://claudiamelchior.it/images/file/53999245663.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+conjuring+in+spanish+full+movie
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 16792 bytes
font_01_sfnt_off0000da37.bin
973177e1696ec864d8f948fd8c19e58fbe0317635916cb09e3fcbf0ba143333e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 17236 bytes