Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4589ca9a294bfa…

MALICIOUS

PDF

86.3 KB Created: 2021-09-22 19:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f80495142521d116585aadaaa27360c4 SHA-1: 51114e5f851c8959fdd4759e1c61e9f3c7852460 SHA-256: ea4589ca9a294bfa736eda05670078d1df665be36b9bf218412dc79da8626db1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. ClamAV and ML heuristics identify this PDF as malicious, specifically a phishing or trojan variant. While no scripts were directly extracted, the structure and heuristic firings strongly suggest an intent to redirect users to malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://booklandbooks.com/userfiles/file/47458659508.pdf In PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rokimurid.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nusevizonof.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/74494267359.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/30715002561.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/nerifezudenulepikowupi.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/toxuko.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/78695064728.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/velapudijunip.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/67855501209.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/bixebuxogumunavod.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/denore.pdfIn PDF document text
    • http://moretonassets.net/userfiles/40280335538.pdfIn PDF document text
    • http://thongthien.vn/upload/files/munenazimomawewix.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631579728.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/takuwidagasidefanexuset.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/20620621450.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/pilekodosasab.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/tufunexirabagogoveza.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/78785959271.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/5667166221.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/87820699027.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/vaked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+purpose+of+an+electronic+portfolioPDF 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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10668 bytes
SHA-256: c9ccbd6d1b80784e0ba3d5c969fec202d747bf7baadf68d054baa6cc6e9dc04d
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 17564 bytes
SHA-256: c714cdb810af118df553472530d0f5571a233789ebf3c07ceb56449595117758