Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1a69a1c97d90f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 12:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e62abd68597d3b35cb5198ae7eb13cdc SHA-1: deec27ca544f6568c1bea5a704a404dd7faf189c SHA-256: ecf1a69a1c97d90f4bb8d8941e84974b0b7bca3ffe37ddef3458c5587361b334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The PDF structure and the presence of external URI heuristics suggest it's designed as a lure, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hoanhaochemical.com/uploads/files/sebijuzatutubamemovere.pdf In PDF document text
    • https://cmottaviproductive.it/uploads/file/lofogagufuletibaxejebo.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vejesoferatagevuligom.pdfIn PDF document text
    • https://topupdana.com/contents/files/gusop.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/81894551535.pdfIn PDF document text
    • http://plncse.hu/php_data/file/punoxujevemomuxipafutole.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/39259222843.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xilopofawupu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jeruvopesibujaviravi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/19679729868.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/73455283931.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/vezisonuteketawin.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/sewenumami.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bavad.pdfIn PDF document text
    • https://losungversorger.com/product/file/14791455588.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/sekegusonitemosulasa.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/fafujerupamanipe.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/wapukizopoxutap.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/98658793533.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/35167778766.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/gevevinokilijupujarur.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/84484551934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sky+4k+apk+downloadPDF 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_off0000b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 10240 bytes
SHA-256: b298a715c77c7431d4673d8c9887367cbfb5e73171b213d71dd59ca759b8ea48
font_01_sfnt_off0000c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 15948 bytes
SHA-256: f8dbcd30cc5d0c46b15c6b0836a1aed2a245c8335d87f0ca99547ea4e75fadce

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