Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852dec5cf71a7c9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4210311d3a8583b8bbcbf0eaa5eb230d SHA-1: bee755dd104cb4154ce6d6ae96504dff1c72ba08 SHA-256: 5852dec5cf71a7c9ffb5e1eb72f3ebe1571e5ad0b5f42f3eb033f1ea08aa356c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing lure. The heuristic 'SE_MFA_LURE' indicates the document's intent to harvest credentials through fake MFA or one-time code prompts. Numerous unknown URLs were extracted, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://tumwebthailand.com/ckfinder/userfiles/files/95142246280.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/90555613736.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/wufajijenuzofubiwiromax.pdfIn PDF document text
    • https://jagominum.com/contents/files/jenegugovakotanijarexiz.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/72956141816.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/bowidu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/fowutezixuwujarogadoporo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/68298108585.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/koture.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/86758736265.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/kenavodamifimepubuwuwe.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nuxabasubisevulizibodi.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/10394736047.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101126009280.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/75491482733.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/giwavesavewoxikofitole.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acf2a8a72---legafo.pdfIn PDF document text
    • https://onlinendttraining.net/files/87367136940.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sovak.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/13344055110.pdfIn PDF document text
    • http://sergeybazarov.ru/file/telawakunivop.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gatokisiforodo.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/punewig.pdfIn PDF document text
    • http://ceroki.com/image/files/ropukenufipuxujivibejeze.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc7e3a7fc---molanadifebita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=recover+admin+password+macPDF 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 17192 bytes
SHA-256: 69f22dec075f08eda8fe175763e4578301af6c050fdb2726ebd3d44cde992e59
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10728 bytes
SHA-256: dee424246738921d073245308f8a24bfc1e63c15e7421377ee83f5a46a09dda4