Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9524b726ce01f9d…

MALICIOUS

PDF

86.3 KB Created: 2021-10-19 16:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0680c41f56841d40836d039dd04ad806 SHA-1: bc2f0da27b53226f23dbbbef47211cc47341cf57 SHA-256: e9524b726ce01f9d0c4656865d1e807777f8a2858f9b52cff911c49bf17e9005
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://allytemp.ru/uplcv?utm_term=my+sweet+roomies+characters PDF link annotation
    • https://rajatotogroup4.com/contents/files/14842119515.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zuzutamafivejoludonovude.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/raxer.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/bunufugisiw.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/wisufuw.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/65953770589.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145c821deee6---kobavezojigelul.pdfIn PDF document text
    • http://esteel.my/userfiles/file/32851328017.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zavutopiraxixijibujox.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jikitudirogozimitov.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/sukusoverovegefiramebas.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/zisenajavuweni.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616247c41d719---99255794284.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/walikogegizemovewuna.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/42273794400.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/98589847211.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/xedaxutulawisefem.pdfIn PDF document text
    • http://oilspecchem.com/files/gebizel.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/gezeb.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/piwomitevuxugulupusegi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rafomuwazutedanezavalera.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/10696840160.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/runuvipelasovefe.pdfIn PDF document text
    • http://attlas.center/userfiles/file/88011998592.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/84387714181.pdfIn PDF document text
    • http://tianjin.relieved007.cn/upload/files/dolomedifoxepu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17352 bytes
SHA-256: b51bd52ba3e27b7ce4243b052b67dae7fb2f41616c761dd9df65fdd4d24e1b79
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 10536 bytes
SHA-256: 71f77862ed92bafcb8a088bfb7f4b1ef8fda7b5f88854440c97e199dae26db37