Malicious PDF — malware analysis report

Static analysis result for SHA-256 597252925043d1cd…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 13:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d826dbe2d0e9728bfcd27b89c8ffdfea SHA-1: e7475b2d6ce3daa576e734ec3021768bc58fac48 SHA-256: 597252925043d1cd66e96b446c5e9d962635f56c0fe884cd9d27c1e561fc8f3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious content. The presence of a 'Callback phishing phone lure' heuristic and the ML classifier's high confidence score suggest a phishing or scam campaign. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=stickman+legends+ninja+warriors+shadow+war+mod+apk PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/65031843417.pdfIn PDF document text
    • http://askort.pl/Upload/file/kabenoruxinefozovabemalun.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/vupipogim.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/17574397419.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1150294020.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/519745197.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/46578339204.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/30909951446.pdfIn PDF document text
    • https://iwistw.com/upload/files/89144118881.pdfIn PDF document text
    • http://elitk.ru/_files/77766282330.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/60604493814.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/42475550528.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/24028072783.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/figan.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d277c7f2---81713777739.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/47478822317.pdfIn PDF document text
    • http://ceroki.com/image/files/mivis.pdfIn PDF document text
    • http://sin-hua.org/userfiles/23103509471.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tilumobowitafadukut.pdfIn PDF document text
    • http://montesantangelo.it/files/files/zavekufegesa.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/46608143550.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-1/20210901105426436220.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/56903078041.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12065891951.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a347172---kerezutal.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/gatakatotekomerope.pdfIn PDF document text
    • 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_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16488 bytes
SHA-256: bc80de021083f5a47d8f8f4358a95b8d60fd7a4d9a0b5c5a7ea38d6e3cbf8d99
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 11344 bytes
SHA-256: c0823149863e5e35a0b6e28b892d1cbd4b2a30bfbc69cb8fa176ec12d50c548f