Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c39bac96fc3aa0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 16:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a750c6ece6837d4e187f4af9da0cc7cd SHA-1: 7425d10fac84e7490ac4f76d756a3bfbe6d21a37 SHA-256: 66c39bac96fc3aa008b2dfbb25da6f9aeb95fd652a07904a78d9db8a9cc1edc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with specific detections for PDF phishing and trojans. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially compromised or disposable domains, indicates an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for obfuscation or distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://acupunctuuryao.nl/ckfinder/userfiles/files/gedifutotatevizodemepu.pdf In PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/35355277529.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/diraso.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/fikogowifu.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/josikujires.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/53718461049.pdfIn PDF document text
    • http://modero.vn/upload/files/moxupopisusigikirebu.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/koziv.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/64250610346.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c3d057a2abbb87f0bf40b50b8050036/puxavexosikisukeripi.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/bubetizadato.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/fivolakajovevaradeg.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/96637577906.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/4207048618.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/46316570974.pdfIn PDF document text
    • http://travellerisland.com/files/67551100775.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/49895927906.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/42146653721.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/fajorobod.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/43661999398.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/13770700444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mehrere+google+kalender+androidPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/23815863976.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_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 16988 bytes
SHA-256: 0b9da0f8f43676004bf8aa0f9f722057c38101aa285c8309d5b4e05f9a590817
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10348 bytes
SHA-256: b9107f4f93a801452c80a2fdf3fc8e43dff56568b32c6edb2b2358de5156a392

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