Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe07220d4b2e783c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 04:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65625f66230169ef2cbfcdd6f43f9041 SHA-1: 91d365c5d3af2658f79af7d959fafeff0f5b3f1c SHA-256: fe07220d4b2e783ccb1b3041e16c1647e224f49ce226c7706c368525f202d92d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tlumacz-bialystok.pl/pliki/file/jekuvedevejodas.pdf In PDF document text
    • http://saddabro.com/userfiles/file/sutomatag.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/fonasesudivigujasepozulaj.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/91050857977.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ba9deb811e5794c9f11e10172796c2d2/86984794117.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wekapanikizaj.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/65554139531.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61352322ec0e4.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/50765527014.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/xovetimowumasuda.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/13652053576.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/40795649393.pdfIn PDF document text
    • http://toonesk.com/upload/40016503295.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/54741448836.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sebonidusidi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fubagexemat.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwukoxezaxetelemamafela.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rokobirobavilerutupunix.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/33549085023.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161340ee88652e---84373816041.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/72922032474.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/21388481109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+free+download+android+phonePDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 17088 bytes
SHA-256: 05645c48960d0af5ecc2f1442d9ac14e0e22503b388c02f29623abaf282bbacf
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 10628 bytes
SHA-256: dfc6b3c6b8881cd3f7c468674021850dbc0a567d39686472491ea8075c068cb8