Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3b8aee69aa42cd…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 19:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 685df401ef4744397ad5c3080718cb08 SHA-1: 919aa599a274f68c39bbfca568f8dbfe6b8b180c SHA-256: df3b8aee69aa42cdbd17dec81761e776082d2afa59e37718acb04c2c6854b469
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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://cafesca.org/ckfinder/userfiles/files/50274471913.pdf In PDF document text
    • http://ontis.sk/editor_uploads/system/files/nogekadata.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/37877533120.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/toxelisixoduxor.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/72795399387.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/tiziluxabaparefufokipux.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/69392809661.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/84447914241.pdfIn PDF document text
    • http://theponghop.com/upload/files/vuwesaluxuwegarogapababib.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e6eb8b00a5f5844623ee1306db6954ff/71114251090.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/pavanegevinamegoturirataz.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f5ffd2bf14225ae30d85acaff033f4ca/59218319455.pdfIn PDF document text
    • http://egitara.com/upfiles/files/92418314604.pdfIn PDF document text
    • http://immopolignano.lu/images/zureli.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jalemozexodoko.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/12433474111.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mizubifixalipesem.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/tenob.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/wejozufemevulejubodelemu.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/wozawinetikis.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/meduxesuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=app+notepad+for+androidPDF 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_off0000acca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 10256 bytes
SHA-256: 080c08847ddb3b31c447588e13e76ccee328857edde147aa2389725ef981e510
font_02_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16412 bytes
SHA-256: f6edc6a53034edc0382a3888e128e219699c8d5c3597848376c8f9d66357022f