Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef8e59c1aab0be2…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 12:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cf1c43d3ba4c846c88dcf7e65ab258b4 SHA-1: d8bf3ceb40b2e8729f9cc8c707283007d66ff659 SHA-256: 3ef8e59c1aab0be29e8651637e64eb55ab42bfebcfe82a729018e37d2dd14436
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be directing users to a malicious external PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sushistoryus.com/uploads/files/96277587029.pdf In PDF document text
    • http://etkindenetim.com/resimler/files/vogimiba.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/vamuxamoseponifemila.pdfIn PDF document text
    • http://ty-int.com/files/files/lilapon.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/95122931352.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/tebimojuxobejawijofulitox.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12230502338.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/74991132865.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/47136686263.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mukugididovetokozoku.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/13471587016.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/24535704115.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/4237760903.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/17573196498.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/rofiv.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/88602114972.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101533038409.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/80160639317.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimugisubonetasube.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/83828234662.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/nemubupajezenof.pdfIn PDF document text
    • https://actorconseil.com/files/file/guxagapafajiwedube.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/2202946557.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/vepoguvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+power+of+self+discipline+book+pdfPDF 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_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 17392 bytes
SHA-256: 4bc5140cd4f419fc78a72178be5ba733226da02e85331840ab38ea56c04ca35d
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10740 bytes
SHA-256: 2743b9cba15d64e02f66a1f605083289204f165dcfffbdbb9974ba4314e465a7
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1