Malicious PDF — malware analysis report

Static analysis result for SHA-256 8399738541bfdc7e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 12:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b58024d2dfe074e1849d0738d0abdb20 SHA-1: de61fd642464c041a9a6f42147bc112a9c926096 SHA-256: 8399738541bfdc7e6448ba3cbb4a413a0eb9edb4b47eb53c15cdbf5346e5cd83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and multiple external URLs, suggesting it's designed to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is likely a phishing attempt, prompting the user to call a number for a fake issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://ketchas.ru/uplcv?utm_term=idioma+espa%C3%B1ol+android PDF link annotation
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/97102289779.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428924e5865---tegenutumakiperumobi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/xajukazuvef.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28644103319.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/tupeturizisixolatuxe.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/juregumasepimufikofer.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/39214026179.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/7682619468.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/46918520639.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/30535863668.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/87443997806.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wezawaba.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/wuvibow.pdfIn PDF document text
    • https://auto826.com/uploads/files/84851986344.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tuzanomefurixel.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/nateja.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/finapazuvosofepanekifon.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/12490550244.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/22666871443.pdfIn PDF document text
    • https://agrando.cz/files/file/24052318368.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/kejonimasokokobawafe.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/42457347938.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/84854400646.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozodimugoziloximureda.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lalelebitu.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/tuteladanetufodijote.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 18612 bytes
SHA-256: 11f40386bae5140aacbcd47b18ebcefe718638973e5df9a22332723804e0de75
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10612 bytes
SHA-256: 102dd7facad3c28fcc899f1a129dc8012b49d7c0f43735e97223d9c89833c60a
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.