Malicious PDF — malware analysis report

Static analysis result for SHA-256 339cd3f7857de99a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 01:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 790b67264d384aa8920f384e4a80a8e3 SHA-1: b20485b81977941a9fa042ec7dbc0a417675ab1c SHA-256: 339cd3f7857de99a532286d130407ce57f48cdefb669a22c3bd190efe6077bcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, containing numerous links to potentially malicious or phishing sites. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ertp27e275730kmo0lebsb8qeb/9843220303.pdf In PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/ramuga.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/zoluzosu.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/tevipijomiremew.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/24102720296.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/41255634022.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/numuxamoribemolaxejonebun.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/vugowavolupomebawudelepe.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/69576458330.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kevirijagaj.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/99699179277.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/furovepisuvarag.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ad4a2c0c4f292c6e9060f394e935adce/fumofuwagemenotezebak.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/11365023114.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/97589366300.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52817780674.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/60320025060.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/vasujusenuxanuwaxa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59218833591.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/lemagodibunaned.pdfIn PDF document text
    • http://ilkemymm.com/image/files/95261087374.pdfIn PDF document text
    • http://rayer.cn/d/files/3191530010.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/97938369716.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/sikutejajigux.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/koberugukali.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fivajutilusejikowixebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+friends+season+5+123moviesPDF 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_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16088 bytes
SHA-256: ae299372a49ab9cb108cfb29eebaaa71608c30b69ceda4a0e1ae96f01dbede41
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 11232 bytes
SHA-256: 985013d2c9bd39711f261bb2122e3b839a89f228b8b2991e5dcb0fea3eb895de