Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5069c6c8871cec…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 22:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd2df54acb3aad776c409749bd0f7c8f SHA-1: 4ef1ead2efaf8c8133d6892d188e24f452d21ada SHA-256: 8d5069c6c8871cec69963f701bd797eddbd6be3d68dd3b1fcf7e79031673f495
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for malicious purposes. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, possibly using embedded JavaScript to facilitate the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://portalinmobiliario24.com/uploades/fckeditorfile/kuzuzitu.pdf In PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/50724712448.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/82085198297.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/jibesutexedas.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/10293410345.pdfIn PDF document text
    • https://primer-spb.ru/files/files/dufinafinulemu.pdfIn PDF document text
    • http://grimastone.ru/files/sivevevaxeboza.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/togimuverozilogow.pdfIn PDF document text
    • https://defi128.com/userfiles/files/83914631334.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/11083782408.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/86395980778.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/nuzab.pdfIn PDF document text
    • http://wych123.com/upload/files/fupetelubemipixofuka.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/89712884347.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632154366.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/84d6ffafd07c2b083732c0a462077615/xezovukele.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/zowumomagumaxorev.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145677d05ae9---xerinedujijiwawume.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901165348396920.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210920085125.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/motoxezenodulanem.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/77237586100.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/28245125025.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/21392488639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=central+intelligence+torrentPDF 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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 10268 bytes
SHA-256: 6d90787aee47b7d2ed149cd51594568a32b460ee3f1f7f78fae4e61c718d9735
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 17832 bytes
SHA-256: c5bbbfed750327f143e7a690817ee6138b79dd1ff2e5d938d73b0500b125698c
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1