Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c0e7104b033c2e…

MALICIOUS

PDF

97.3 KB Created: 2021-09-10 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8bc5f780fe37e0c3403613965893dce SHA-1: 480de264e11a86f3c0b75a3ca75dc750fee8b12b SHA-256: 47c0e7104b033c2e61e784a9c3b71e316bdc6de9bcf401b634ff0a45b2b5dce9
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links to external PDF files hosted on various domains, indicating a link farm or content distribution network. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://liantoong.com/archive/upload/files/40314002687.pdf In PDF document text
    • https://anninhsieuthi.online/upload/files/62246484813.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/lixejasijapo.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/15024055470.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/vukujewerujigobevalovosi.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/jezudixilarugoral.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/39640206976.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61344f02580fd.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/majitovebamavopuviv.pdfIn PDF document text
    • https://architektor.ru/uploads/file/72415787202.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/83691515.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84325916226.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ferixubezato.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/josilofuxu.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/72101788675.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/60349135902.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/8381453735.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091510407094.pdfIn PDF document text
    • http://machulski.com/public/file/98074270398.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/67339774041.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kefurus.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/11433077597.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/98265931537.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/fetaxevevepub.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937b95c6e0---rajekazo.pdfIn PDF document text
    • http://knipia.com/userfiles/file/95639613545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gba+super+mario+worldPDF 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_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 18420 bytes
SHA-256: 09accccfd6f22ece4278f982e35e2ea3997a6b0c85540ae588d86e525b4d7929
font_02_sfnt_off00015ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC4 10716 bytes
SHA-256: e51d4c4cfa0b73dfdf0f928cbc3d2366b6d9b8bf3aad09bfb8e5282688758c6d