Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed67744e19a9924c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 00:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0edbb82bbf76654576d865aef92f2c13 SHA-1: 5cf75b236851194c1c266c549561eba018ed437e SHA-256: ed67744e19a9924c9e8ab7492978c10de977fb223f298d601fe19e64f3940671
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic point towards the document's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://dambi.pl/userfiles/file/24619763332.pdf In PDF document text
    • http://apcmagon.com/userfiles/voxuriwafikomoma.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/rodemetomejimosuforejofav.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/funavopewowijasexopupag.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/32802164832.pdfIn macro / runtime command snippet
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukovojokupulasux.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nulebupekadalovizaketum.pdfIn PDF document text
    • https://bak.vn/upload/files/lunafuzokukuxero.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/73571282599.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab9e80d71---80480149803.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wawidodunojebejuxusoxom.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/logodidinopotagu.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/80671230520.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xefimururatutexapomegem.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93746856287.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/wugiwuzogadonaruniwonoso.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/46048519599.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902154345_2107231462.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/91318298825.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/809dfe5a213e9cc654161e621cafe57a/55575642251.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8735759523.pdfIn PDF document text
    • http://pvvc.cz/files/tavukefapuw.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sadasopojatajupovemufo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/xipirubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=buscadores+con+flash+para+androidPDF 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_off0000bb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 16868 bytes
SHA-256: 0447d3ca1f5be5a10e5d3e2cf984781e2749bb585b3b601f2706d06b817aa323
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10772 bytes
SHA-256: 712058899871e94f33501145eca934e6e15a5f957055e18e71328916509101bf