Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e147b044471d072…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 16:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d56ee42e8e21f9c12073a4dab90e51cb SHA-1: b64c1be8faa9c5b503e770e5a1165acffab8057e SHA-256: 7e147b044471d07212bceaa1107657d01f5233e5a2c08dc286b0d090329c20dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple external URIs, with one specifically pointing to a URL that appears to be a lure for downloading an Android game, likely a pretext for malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous links on disposable domains, further supporting a malicious intent. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=subway+surfers+for+android+2.3+6+apk+free+download PDF link annotation
    • http://manegedebuitenwijck.nl/uploads/file/ralaworivujuzidevapimiba.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/ximil.pdfIn PDF document text
    • http://peoplefoster.com/pliki/1447852948.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/45092980910.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/90785124697.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/19641857863.pdfIn PDF document text
    • http://vaithun.net/upload/files/suzoxivimiwagiri.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903225622.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906175417.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/ziwigijojagutebogiboke.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/04f2214e9ab7b04e84d88a2a78763e35/babisaputitezunutedetal.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/tijakewagobak.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/xitalupudufilumegor.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/45756314773.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/80715289761.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631785885lafexune.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/23687514233.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/vunolapumepajiwitomininig.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikutelilumewixuwuk.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/91594219085.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/kanumadotozelixokuti.pdfIn PDF document text
    • http://kaies.net/upfiles/file/2089973875.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916215146999.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/54723513361.pdfIn PDF document text
    • 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 17864 bytes
SHA-256: 90ec53d6573fd52a8b27e3752dba87aa5ae2ac3b758e697b8b10b729d4bfdaff
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 11524 bytes
SHA-256: 5f254d36a8868ae49a2253972084242ff058968e720670817298a24248f4e772