Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0ee3c3a3a4eba9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 17:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d23c2c1ed5e6f854cc46d6e1984f2e18 SHA-1: 552f28417a7befbb26db9d0e4056a26d46cd5e00 SHA-256: fd0ee3c3a3a4eba936171cbdb526bc3c55b2388959e34ceee0c3f9af6901a8e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=think+and+grow+rich+pdf+free+online PDF link annotation
    • http://bienchidan.org/uploads/files/4925413432.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/26704124533.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/87355473957.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/87487233406.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/rujigenunoralodadaxobez.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d5eec103---jajab.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/20884423109.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vezetu.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17779221695.pdfIn PDF document text
    • http://orthodoxnews.us/file/29600421809.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/mofelulakedo.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xiwelutimibuj.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/61389764016.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/23511259962.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/95295769506.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/5256240536.pdfIn PDF document text
    • https://hiroyoung.com/data/files/96599159101.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suxuvuve.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zinakifexebaxiwozet.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nodenemulonikujadimuko.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/lozom.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140a874b89c6---wekipe.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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 17472 bytes
SHA-256: 5e77bea303ec52fbb4eb9cc1784ceebfaa38cdd9514315832e40a245c30f1637
font_01_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 10776 bytes
SHA-256: 3828a59306672ae39cf48df721ae97f2c93ed570887161e770dd356928929251
font_02_sfnt_off00012931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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