Malicious PDF — malware analysis report

Static analysis result for SHA-256 78415b43f7573c6a…

MALICIOUS

PDF

71.9 KB Created: 2021-10-04 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad7084ff54413592401e4e6fdc71e0b8 SHA-1: 3660bb228eb5271b2f7e2f65f45048d1b2fa4c48 SHA-256: 78415b43f7573c6a325e35b81cb6cbff9746c361a49f2032fd3636ebf3de5962
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, potentially initiating further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=burning+of+magnesium+ribbon+is+a+chemical+change PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d514dc5a2b1f875a66bbe65a60f10f80/jokogetenonuxozuwetowur.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/37518744928.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130216354904---xuwalavulun.pdfIn PDF document text
    • http://wohntraumgmbh.at/vimorifonetodozegesof.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/89840337209.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zununifetikoko.pdfIn PDF document text
    • https://suny.cz/files/file/legusovulixototoletitaje.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/53606554401.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/vorokudirufipuropefovato.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210920165515.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/20337314079.pdfIn PDF document text
    • https://vendax.ro/files/file/31024779364.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/68892976965.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/mafudidaluzobikow.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/23420017345.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/sobunozisasitazenebulujez.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xivabavelexegofozixore.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/rejepazojopijivo.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/99586678135.pdfIn PDF document text
    • https://partnermind.cz/images/files/52259598184.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/51639788417.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/niforuvakixower.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/99378189780.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/kuwidiwe.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/sopaxejogotudi.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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 10980 bytes
SHA-256: 706e6bc320ee5bc58295607a0902973e89ee2c32385da59474ca7bd9dfc12875
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 17432 bytes
SHA-256: 27dfd16233f27f73988fa65a3b23f4b55650306d2e4afd47f24c2ef4c4fe77d6