Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb8f1847b9603df…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d303f422e6049e53eb5aed7f43c67c67 SHA-1: 4109f460e0f2b8d6037e2e9e4e629e3e89ff4d31 SHA-256: ddb8f1847b9603df1b42c3c6316e51a02eaa8453814fd673ecab1a2767a84643
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a89417bc97f9788eb6421700166701a2/zobupi.pdf In PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/44865918389.pdfIn PDF document text
    • http://hidramaco.com/files/files/17118031494.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/20175009073.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/lezuloroxudunudinogokivi.pdfIn PDF document text
    • http://freetds.net/userfiles/file/boruvisabotafulekuw.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bidagivulafopuw.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5993ab89---31476930023.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/wibawudisipadulaxu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dujisojemujotukejozuj.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kawadiluwide.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/43999506017.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/37583671561.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/lifojekelogejejala.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/zudevimigilagokuf.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/42497947523.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/papuwagiwubowe.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/bexuzepazatekenizisogiko.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/lovagupoxofuluk.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631282731nanovejemixo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/16238085024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=can+iphone+connect+to+android+tvPDF 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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 18604 bytes
SHA-256: ee4dbc431c039d5f6bf41c812e27cc287460f55a573b62d811ffd48d147988bd
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10492 bytes
SHA-256: ee8c1e483030902149316a9dcedc8b2dee3bc26f90fab5d29dae7d2eaa6fcd5b
font_02_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1