Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2a0ca52a9e1697…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 14:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61810b37cc4d71337619c5fb0b0d4d21 SHA-1: 6bf7c83baf883857896114895a8ad0a461cde933 SHA-256: ed2a0ca52a9e169777b746f92a2cffd05cd4156ee9d652fceb9658b9a95639d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smartcirclegroup.com/userfiles/file/98431339930.pdf In PDF document text
    • http://3bbb.fr/ckeditor/upload/files/86578995470.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/71493144158.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/sabawizewaludapom.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/kopozitaxanokejugegavikil.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mikuxuxavozonomuputi.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/25848117193.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/66396993622.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/nabafirexozabivabagadu.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/dukalajokijuvewalikaxaziw.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/gokogif.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowuk.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109100915569470.pdfIn PDF document text
    • https://bdata.vn/upload/files/52676696881.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109100303472302.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/3790339746130d908b5523.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zorali.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/95965944592.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/15917944517.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/98407036666.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/bojujada.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/55725007937.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a25bd1621---61014469438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hands+free+answering+androidPDF 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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16696 bytes
SHA-256: cecd74a840f734517533c625e92aa704ec7dda5c7037f5a83fe841cbe8bf5d61
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 10464 bytes
SHA-256: 7aa5af895b8d1c85cce276a03cbb6824293e8bfe624fc118f7e6b595d930c510

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