Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e505e072f4e7e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 07:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6e4e2dd5e15be1d177f818d0a70c316 SHA-1: 732a85370aca3bfac3d6ebadb5ce2fff89d0628e SHA-256: 5a4e505e072f4e7e87c772a11607833e960c789272b608f7a80a1dde153cf350
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, directing users to numerous distinct domains, one of which is identified as potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 http://csc0532.com/userfiles/file/20210912104835_r2cire.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/53143809540.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gudoxojif.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/xukumaguwotuwagazi.pdfIn PDF document text
    • http://roocenter.ru/upload/file/20013439055.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/8299508966.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/zatodet.pdfIn PDF document text
    • http://bociany.sk/media/file/xumojudunewoxosetugoj.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/2524214339.pdfIn PDF document text
    • http://vina2002.com/uploads/files/9180481134.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/65765301666.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/47937652205.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/mibuzakikejamunumij.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41778bbf0---43075472774.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/99071659028.pdfIn PDF document text
    • https://fuoriscena.eu/file/24522740169.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/11453870657.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/rexupigava.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/17321806450.pdfIn PDF document text
    • https://kermanrooz.com/img/files/36852783394.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mapaxupexasesitekesedex.pdfIn PDF document text
    • http://test-immo.com/file/likevojiwitizefofefe.pdfIn PDF document text
    • http://seto.cz/uploads/gidiwezenukolekuxubogi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba471567f7---93005770855.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jorufejofatazalunom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hill+climb+race+2+modPDF 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 17860 bytes
SHA-256: 8b36b26fd130794cc5251bbd0b393d5dadf2d6ddbbf83bc3b047bab2127ccb27
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10412 bytes
SHA-256: 0b6b1112a0a4b880028caf99d8b5e9ed4e21482da9c54610a4a20aa0f8aa2b40