Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5788a5d59347e2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 14:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b03cd47bc2b16b454a1e9b062f13b58 SHA-1: ceb4c0970e48686f8d0f78874e98ee569a61c7d4 SHA-256: 1f5788a5d59347e2961f736f7be97566654fe0ddc6297d60965c006db1e94b39
174 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of PDF heuristics related to link farms and disposable hosting, combined with embedded URLs, suggests a phishing or credential harvesting attempt. The 'Password-protected archive handoff' heuristic indicates the document is likely a lure to trick users into downloading and opening a password-protected malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=computer+networks+and+internets+5th+edition+pdf PDF link annotation
    • http://bagliodeimille.it/userfiles/files/wewukubibexabogoz.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zazulanudipemebe.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/46913082398.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/85958408898.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/puzumikatebiwufebeza.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bifizozawazig.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/25807746232.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///22221104350.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/sotatotagujerutofuxosid.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/wagedaradebu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zafamawenu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/wuraku.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/75240150138.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/linitolufevij.pdfIn PDF document text
    • https://wasael.com/userfiles/file/69600339523.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/kubogoxifazajurubokepo.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/42468498641.pdfIn PDF document text
    • https://armenia4d.com/contents/files/dekazipilewetux.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/02697f91b1fd5a3f07b6ca9befc64fc6/80175810030.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430be8be601---nolafuvunuxiwegefitozu.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/93474158466.pdfIn PDF document text
    • http://poorclarescork.ie/images/89209793014.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/zomuwezowaguxelu.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_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 16472 bytes
SHA-256: cb185dc68e00f54924b2d56b8c43c59f74aab667e797c945bfb9a11da029ec3b
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 11160 bytes
SHA-256: a6bbe257f0bb2b5fd559180224ac54e835bdb3684a6b7c09e1ea3aaf83f4e2de
font_02_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1