Malicious PDF — malware analysis report

Static analysis result for SHA-256 a718fd667838778a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 09:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 093329b95c18bd613bbdaaa266bc2e8b SHA-1: 02e5e8d312aade77c695e1266c2aeeb12abdec09 SHA-256: a718fd667838778aec0acdbd21ac22b572359519e373634794a6f4f399ba7b59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://to-kajihan.net/js/upload/files/42413941612.pdf In PDF document text
    • http://doradcyprawni.com/images/pliki/46531794333.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/pigibarexegojivove.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/zunexogukozorirakum.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/2273759079.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/420150719.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/wadologonine.pdfIn PDF document text
    • http://ccshecea.org/upload/files/18483707676.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sutajipomulobilujidud.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remunelotezu.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/25365209885.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df44c91f33---95494764318.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/boveviridaguzuxev.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/didasufixumafanupuju.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/39377205477.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vupijubom.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/lukijomobetexubasabozun.pdfIn PDF document text
    • http://cwesp.biz/upload/file/73412207214.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/83536032098.pdfIn PDF document text
    • https://edarky.net/data/file/pebujoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=boruto+naruto+next+generations+178PDF 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 17756 bytes
SHA-256: 9d33a337ce3fb26576381149bbd20a1280331adb36a6b814b1890f16a0e29b19
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 10800 bytes
SHA-256: c1db8caf5122ef7005da8f4e15263221ba21fc24afbc2d72a916bded89413b23

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