Malicious PDF — malware analysis report

Static analysis result for SHA-256 921bf062cb20c6f7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 03:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ebbc22e729eece99481e6a4bf656ed70 SHA-1: b24da418fc8ca9fc090d73d5149b361ec3ec4f02 SHA-256: 921bf062cb20c6f745dc3142b914a9d64453ac8be618dfc8fb668dfd7cf9f133
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/zogek.pdf In PDF document text
    • https://mimpi1pusat.com/contents/files/946008121.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xulif.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/49793438657.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nigexit.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/77093669228.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161301f97506fb---54349562318.pdfIn PDF document text
    • https://ksuskalology.com/images/file/sawitebogaxijubusuvo.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vaxazuno.pdfIn PDF document text
    • http://domosplast.hu/files/file/pogelakimixorazonezoxudo.pdfIn PDF document text
    • https://12shio1.com/contents/files/38102699123.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wuzesiwemelesuzo.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/12760165387.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/linesilotudelowusux.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/korobef.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/74746796599.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_041604.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/saif5p76ag4h5s0oeqivfukjub/23990708139.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/tovirafevexajowanuponeli.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94463933769.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/83793948554.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/zuzevekazawilen.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/50797228261.pdfIn PDF document text
    • http://szm.hu/userfiles/file/3982790303.pdfIn PDF document text
    • http://schokobrunnen.com/idata/92030434820.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/65159114702.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/77229293842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+game+gangstar+city+mod+apkPDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 17088 bytes
SHA-256: 2d93a7d856147495e717d9febc3d0c8b9299681b661b561f58787a068fa7b726
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11152 bytes
SHA-256: 0e3222a3aa621ed1e70d6cf2b16838b944296548a588fee13eb96f9b82316f75
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1