Malicious PDF — malware analysis report

Static analysis result for SHA-256 770b5ea32ebbdcdc…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 16:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75f9fb8ac32eb9ca656a47667486e1cd SHA-1: 3e69e9113ed3dcc34e9ab0836d4d07148177c1e8 SHA-256: 770b5ea32ebbdcdc4a267697e1c4b65882aedb2375e4aaac2a04be24d4420c56
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating an attempt to redirect the user to malicious content. The ML classifier strongly supports a malicious verdict, and ClamAV detection confirms this. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://speculatio.in/userfiles/file/23303298685.pdf In PDF document text
    • http://investgeorgia.ge/userfiles/file/41330432800.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/wujefiranamuwikakip.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/69558064600.pdfIn PDF document text
    • https://arerp.kr/data/file///4190803329.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wumimagotiginatin.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/74594604994.pdfIn PDF document text
    • https://aromamarketing.md/img/files/30597533460.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/kanedefedore.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/rupaxujuxuzewo.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/rukani.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/47150919923.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/bebirajut.pdfIn PDF document text
    • https://ewt.cz/res/file/28137933604.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jinezotoxodituvetonarij.pdfIn PDF document text
    • http://kahasat.cz/data/file/74118908876.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/36590491139.pdfIn PDF document text
    • http://zuszdounky.cz/files/fawemofokozu.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/853552381.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/redinemu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/681sb7nua5333bjj5u0o62hlv1/kigiterivujimepaba.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/neluvulef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323eb5e72bc---renigijona.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/83877452500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+fire+android+apkPDF 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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 17644 bytes
SHA-256: 688c57f23cc85cce3de8bd17e2c4c91726e2d1c3b74a73f21b66aeafbbb829ef
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10248 bytes
SHA-256: 185031875407db0116641ee5a510d6cf21bf6bb624d52f17237711879ff4cf1a