Malicious PDF — malware analysis report

Static analysis result for SHA-256 393456acaa66d868…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 15:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 413e9993ec8fafc5d331597ef435960d SHA-1: 975c7f1a4509dd8160b217693053e97416f89e2a SHA-256: 393456acaa66d8687eb64a1b21de139cadc70119dfb51a1212fc2a545092780a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or credential harvesting attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=ready+to+wear+apparel+analysis+pdf PDF link annotation
    • https://skvacations.com/userfiles/file/lulefuxikawuzafu.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/11871873115.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/sasalaxozafig.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/19186642590.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4831081c---kenifaki.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/13420037710.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kolap.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/jonejubeleroz.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/47842224367.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/39359894520.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/63000411603.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/vabunojune.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/8649554293.pdfIn PDF document text
    • http://nineslash.com/user_file/file/wuxobavexir.pdfIn PDF document text
    • http://eternaseguros.net/files/files/68439878320.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/11424630655.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tijexibebetepenu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/vojilidobujekutenimulu.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/mejotulajafeso.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/zajororem.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/53477004697.pdfIn PDF document text
    • http://eternaseguros.net/files/files/1298431109.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 17608 bytes
SHA-256: 412e80e6abac933015b0a4ac45aebadce8c1cfe9dd45f0e42387e686cc2e614e
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10736 bytes
SHA-256: 987c4ee2d852593d1defc4b61d1e818dac22cc6bb842e75baeebc7d05a7da46e

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