Malicious PDF — malware analysis report

Static analysis result for SHA-256 123777cd361f6cbc…

MALICIOUS

PDF

72.6 KB Created: 2021-10-11 23:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 112f93ad5c1417468a8e33043a884ad1 SHA-1: 65b0182d1fb96309a561f8f08779427c7c44dadb SHA-256: 123777cd361f6cbcd26485837b66aa47d57327cf53b0223392b62b0426aa0768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The primary attack vector appears to be luring users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lsphc.com/userfiles/file///gopidatinejanitajakiwul.pdf In PDF document text
    • https://rougezenekar.hu/files/file/43711179021.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/7686349353.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/3577876506.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2usii6udgp87t8pj7mekk955sq/kagiwinizeg.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/73294825048.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce935de281---2427533581.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/dofibarolov.pdfIn PDF document text
    • https://longhoang.vn/upload/files/saxokunolejik.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/60103938887.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tuvunepibojapuwolerix.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/nupowenikiwu.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/48562684129.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/18435901942.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/1055730149.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/75949275928.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/tikogereve.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/81620212630.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/wenovakawe.pdfIn PDF document text
    • https://ccskin.com/geektic/files/lumotuzuvedu.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/balidosaxebokona.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/57712144469.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/26913004871.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=bring+in+past+formPDF link annotation
    • 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_off0000bac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 10576 bytes
SHA-256: 4236279132cf39a77596d374db4c3894bae4431ac3227a84aa20cf6463f901cb
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 16340 bytes
SHA-256: 464733b3717b0b75f2ce9b9c3e4d9e779b6b04bcc13ee828add1136da8ef341e