Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb761ce475f2a3f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 15:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 76025fafcbf47dab1fea1a03b0c18a39 SHA-1: 0473c8031de1c69cf0159877fb5c97fb8f45ebdc SHA-256: beb761ce475f2a3f9f07faa40feb4381994119c4e00f9466348576348587d832
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is part of a link farm, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zhongyuemedia.com/filespath/files/20210914002824.pdf In PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/tefexumuwakiwopekesubaz.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/juwuwufupopozakuragef.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/zetuva.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fomib.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/40223814116.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vumazobedega.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/44601955964.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa923c703---1569761232.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/werikunanasopumezedotex.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109131906118239.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/xabaluvelawodudowomok.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_1E30F2E464AEA547.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/99015552797.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4de45245---wuzuzidafuviju.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/96579746824.pdfIn PDF document text
    • https://eurotig.ro/file/mipapijivevuwa.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/97301809466.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/45611440209.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/18315621722.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/10347707899.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/nizilinagadetiwefuf.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/26079203771.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50441210844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=handy+3d+scanner+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_off0000bc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 10520 bytes
SHA-256: 251da760b4d22a99111f00844424fae88614ceff982aa3da984913d4ccb0830c
font_01_sfnt_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 17468 bytes
SHA-256: 1935834b14fb251b24cbfbcd0e34d7b5140b70810978616b159fd5d42367348a
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1