Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7b5d263e947e6d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-14 02:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c45cc4f05a0fc94ea1d29f0ac45b5e6f SHA-1: e76be49c0468e8df6f20ebb9525da29cc8644a87 SHA-256: 2d7b5d263e947e6de055e98577ae6559fbfb27a8169f2bc590ae4d1bf3cfd123
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trufeel.com/ckeditor/ckfinder/uploadfile/files/96086037495.pdf In PDF document text
    • http://www.jasolasia.com/image/upload/File/vodejumu.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/vawupatuwizimalakufaji.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pojitu.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/letevosubakiwud.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/62643891461.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/virakexukovim.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zelevipopuraxuduzelobube.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/fubijivefode.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/legaw.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/48400507172.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/nejugelabubed.pdfIn PDF document text
    • https://cakkue.com/contents/files/tigivorimo.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/28728817276.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/89906497462.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/74908991190.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/10651859640.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/39889834049.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/47615144922.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/15147798455.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vibobawagudoxukefusi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/valatuwadoxapuzi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sinam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=train+to+busan+full+movie+eng+subPDF 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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 10828 bytes
SHA-256: 9c472259a6d9ba45748cb7c8a30db400a187f2658c8e1a423fe017b1937b8894
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 19252 bytes
SHA-256: b61f51f9ea2c7947a2376da2f38e5823ea944d49d7dfad925667e50e94ade4e5