Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ff9496fca361b5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 08:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e91f8f10982f1785dcd0e21fc9a42c4 SHA-1: 121563255db85f4e6ef66af7275f06a237a801f8 SHA-256: f7ff9496fca361b519386ff2fdc563757ced560b68f45e918a94ce89c2c0d131
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38068309456.pdf In PDF document text
    • https://talenthunt.biz/userfiles/file/mupijakepuva.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wowerun.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gawujupewexu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/75579523979.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/51917353081.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cc996f95---67989151611.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/lapaxiwagigaweranu.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/mepufopomuritolisasov.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7421eb86---91707536863.pdfIn PDF document text
    • http://na3.it/misc/file/44577726775.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/84221697563.pdfIn PDF document text
    • http://consade.com/userfiles/file/wivekavu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/34944963358.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/17727393612.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/70218588819.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/delijudewizajebexenose.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/63027792107.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/58268143834.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/bejedurumigajejexekod.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/94898137036.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/79915350156.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/paxojido.pdfIn PDF document text
    • https://fultoys.com/userfiles/zebokovagiji.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tivuparonakaxuxokepifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+quran+audio+appPDF 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_off0000b58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 10636 bytes
SHA-256: be0f327b33179a9e8ca7ce68c378580fc643f786b7c67a878352d7adcb641d44
font_02_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 14852 bytes
SHA-256: 75930b935e181a14b113e3e4854b866a4d83f4dfc0219b0344916e200977372a