Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebaa5bc679cae094…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 11:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 615cb30284022b82b1acbd8c5977ed74 SHA-1: d2daf9e6beeea454f9f83b439b20bc82a5620a83 SHA-256: ebaa5bc679cae094eeffb49b219c33083b5615efb2f77538189a756a1ae3cb45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jasmijnbloemengroen.nl/userfiles/file/ditezem.pdf In PDF document text
    • https://wojczak.pl/userfiles/file/bepatalevatadi.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/6637590032.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/76530050348.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912042249134.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/190506467596.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/96643341243.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210922171621.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/44518614637.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/29152921847.pdfIn PDF document text
    • http://partnercable.hu/files/zazudezaketisuzutujisutij.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/59317671772.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/97847212192.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/ragixekogumijeja.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/lasari.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/poxego.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5466ae3ab---juzisilowidosezuwejetiv.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5ef2d134bdcf56d09938305587563583/talimofire.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/49300615334.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/89796756904.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/ralejok.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sotajajo.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/kolefigetabojuradevexid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+make+an+avatar+on+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_off0000b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 10600 bytes
SHA-256: 71612a3f024840a81addec7d76723e7fc5c6617b11aec9a510fa2f90b5b5a07a
font_02_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 17996 bytes
SHA-256: 0d8285e32c3ce846c8bae8f79ca1f16aecf45f20a3dd5dce8ca408bfd84066a3