Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3ba5e94a10ab2b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 02:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8b444e3b75a4d20f79e0a3637f5f544 SHA-1: 19a2697be42a53b6356f497c45da4ace5a09bb52 SHA-256: 3f3ba5e94a10ab2bc98aa4fc63379eaf3bc7c6ea6c0b0f358d3bf3b8b39879dd
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to act as a link farm, likely to obscure malicious destinations or to generate traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://infrive.ru/uplcv?utm_term=genshin+impact+apk+full PDF link annotation
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/motup.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/42162702450.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/46316823488.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/rogerajevidodemino.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109151010569749.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/xerumapekikot.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/23952534962.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lidukadilumaje.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/21723016560.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/62796215299.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/74486124933.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/fufasefatepukada.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/21023775753.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/bixiri.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dumijosuku.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/43166106144.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wesesojejifimojug.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/74656938179.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/92c9521f3c7f3fa354d8c3093536b5d8/63396849313.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/21137206702.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/davenanuw.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fanonodadibesajipe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d2991e2a---64245504138.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gikidukodevesaloje.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_off0000af0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC724 10756 bytes
SHA-256: b1c20fff1fd82010b36f349a6cb3f94fcad6afbffa504ca003d7baa0e5f28be0
font_02_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 15088 bytes
SHA-256: 0535f8a9e671c2fb4aa501b50cd404c62c36cbc65df1edd3bd099db5aeae4a32