Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fd0931d4d8df06…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 19:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07c5d8e69987a020aac32c4bc4e66671 SHA-1: 94b34d223a5c1671776ab9050ba818d2bb849cf3 SHA-256: 63fd0931d4d8df063719fef5d360825112ef364fbf4bc628fecec979fb32eb4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=erasing+android+phone PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3193ce974---wofalokebejanobavewife.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7d11dc26---nemosababanonigudifurilo.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/9604539932.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/95310502622.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/67117159411.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/jesivizejibapovovadami.pdfIn PDF document text
    • http://grupophi.es/uploads/files/fonowabezoxirabejalimix.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/7534840757.pdfIn PDF document text
    • https://adikkedua.com/contents/files/xubijadogezo.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xonibol.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210920000051_fg9tmo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/kujajamuxane.pdfIn PDF document text
    • http://licausi.it/userfiles/files/51514487024.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/4855459369.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sagapogup.pdfIn PDF document text
    • https://menu2uplus.com/images/file/84304403193.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/lusefijaluxepizosag.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/xukasedur.pdfIn PDF document text
    • http://happy-land.hu/editor_up/52660712766.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zosivumezividakud.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/kesewelitabedilufalisigo.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fewurepoge.pdfIn PDF document text
    • http://aven.su/userfiles/file/80123899902.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10512 bytes
SHA-256: 92ddb0461cc19ed0bcfec21ae4a576dd0dd38e1fca3647ec4ecc0b438e76bbab
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 17620 bytes
SHA-256: 67ed439a13e84afffe9272e3dac58353915a9e011a4468523be12f005482f2b2

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