Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cc94db92407c3d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 21:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c969960f58d1a690c35eebdc2815ace2 SHA-1: c459b47b09bd385c928ff15f03ecdd3fb3e32d2e SHA-256: c8cc94db92407c3db55b9aeb8af0eef1c69f461894c7af1b19794650e1ba3cc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains, indicating a phishing or credential harvesting attempt. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://medvor.ru/uplcv?utm_term=best+free+offline+rpg+games+for+android+2020 PDF link annotation
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/tulivudovatoxu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/dumaniji.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/tiwurofunukarituroxolowu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/49654136171.pdfIn PDF document text
    • http://soupworld.de/upload/file/jukujolox.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/81506457098.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/lewedexafetikep.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31861082799.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/62059818788.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f56d254ef---74728618937.pdfIn PDF document text
    • http://mc-opony.pl/files/file/logefatikotibaduzeji.pdfIn PDF document text
    • http://vo23.ru/upload/file/69548347164.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/mujudijukaduxubinovi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/38288559879.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/98488871971.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/8572822893.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/wuneto.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/62420429056.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/kelejedopeserememabewuj.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/81583239205.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/39723186018.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/zefatiloliwix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16664 bytes
SHA-256: 945c083b90678d270fef3a263df004c3d2245771ced8cf9a11afe5d6a387e13f
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 11136 bytes
SHA-256: b0a7bf1f52b8157589b24d023b012bcadd1053af2fa07fa4457d2216eae24c13

Open this report in the interactive analyzer, or submit your own file for analysis.