Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e327eb0540918d1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 18:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6a3899e3d415fb58ccbedc982cbfd22 SHA-1: 3abc4fc668d85b0d1be964dd65bb8c3fe17ebe5f SHA-256: 7e327eb0540918d1c8d51a2b5bd547aab7598b5f1f37484b56c6069aacad8137
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to execute malicious code or redirect the user to a malicious site. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://lblussana.it/images/file/zefubivoxuf.pdf In PDF document text
    • http://kfbma.org/files/fck/file/76052108036.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/20709794949.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2784c507---desulewijovezitejakara.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/libut.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/98774982909.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pigukevenelu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/04f27ffacea9713a05fc51cd16f61cf5/9394076935.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sepuxideneko.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630690908.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/kafenedevotum.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/wekelag.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • https://artbynela.com/uploads/file/kijilikopizogenilo.pdfIn PDF document text
    • http://irths.com/upload_files/files/89259860664.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/godewavajuvumar.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jagalo.pdfIn PDF document text
    • http://apex-architect.ru/images/file/zutirura.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/65955378564.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/21559691186.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/66326377682.pdfIn PDF document text
    • https://aneri12.eu/res/file/12158668139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=old+phone+as+a+security+cameraPDF 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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 17908 bytes
SHA-256: fa203bfa05808ffd06fd4a880a491490cd6594fd172d7f1388500852f5dc8b8e
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 11016 bytes
SHA-256: 5c0c518c9cbd6405acedd73f4e7ed2a2bbef14952f249c3638b966e6599bc23e