Malicious PDF — malware analysis report

Static analysis result for SHA-256 1690a3b803f81a8c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 04:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49b39c248b2211c1a9cf790d524960d2 SHA-1: ee6678437a426cc4500d4c801f3ef48dfd6cf4af SHA-256: 1690a3b803f81a8c41035ccd2efedbcf6a998f350aa49f328be57505955ef7c4
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://tuzvedo.hu/elemek/file/97767231735.pdf In PDF document text
    • https://verandapattaya.com/userfiles/files/81365158905.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/26760637914.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-17/2109172231299074875mg625wbs5p1.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/dexotesof.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vavipodidarevafakapifip.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/4186817271.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109060549127783.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/zemulizerofatesaga.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/favelevukatuxiwuzekepumoz.pdfIn PDF document text
    • http://ucokampen.com/media/files/masotiwenemonizidixato.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/21365302896.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614526c0b188c---tigejuri.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/32750032014.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109131032554480.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/81703901115.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tiror.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugidipibimodaxuxopug.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dinal.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/48894642637.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/75371475405.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/63695616471.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/tekuzewilalav.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/jaridovetofufos.pdfIn PDF document text
    • http://nemochem.cn/upload/files/pexopivare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=eml+to+pdf+freePDF 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_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 10116 bytes
SHA-256: 82912d41035efbcc4884ab0b7e2de91cd0905a16c49d108a3a4c10fea906139d
font_01_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 17840 bytes
SHA-256: c4489aa7e89546bc38d8e5bd7f04439f674897619fb32c1845331afb9f8817b2