Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc1c602c8c9301c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 23:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e90a841cfe4559bff67cd47b7b183dfc SHA-1: d34ffa00168b5d5625551dd4930b12a80ac8bedc SHA-256: 7fc1c602c8c9301c98b3158c9a103e7d0f87daae6e38dfa731bf7bb9c7e8525f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the high ML score strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=gangstar+vegas+unlimited+money+and+gems PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/jadazilogopetedunenin.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mapimimizefapewulaxa.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zakul.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/gumogupubuzonapuxo.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/85483081082.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/namexuv.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/rovaxatobuzarajivi.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/78732827361.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/mopaketifugosu.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/vudubozedadekugelum.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/62776906441.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/38920495087.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/87061115016.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/48644390138.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/goguxezatikuv.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/dobitopuzod.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/46018111031.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/38771374879.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132634ac16e9---pudewatebiletuzokigo.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/pafas.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jowiniguvoru.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/63168321135.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/zilomixev.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/kopopepezesu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/9412785180.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_off0000bf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16332 bytes
SHA-256: 82e5e4c56fcc85dc019f9302fca1d10e72f3d0fa1fc337e381807e816a816e04
font_02_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10912 bytes
SHA-256: 3b920fa73015e5be2f20a5bd7dee1d1275f94c14d2899c8da9004c4c26f6cbd4