Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc7d82c18f4a219…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 05:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57cbc229eb59f60bb7de3cf32d284379 SHA-1: e6f6a502008863beaeb9ac08ea70ea77e86ec245 SHA-256: ffc7d82c18f4a219f5b06f6ce328a7de437c8d910cb478eec8382a3972c45091
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of a link farm heuristic further supports its role in a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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 http://teen.plovdivweek.com/js/ckfinder/userfiles/files/geruzadiv.pdf In PDF document text
    • http://oishisushigd.com/uploads/files/59069089707.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/punedenuwizitojepanuvuk.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/62151468589.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/wimitaloxekexaja.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/katatilapidifetakazivup.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/36829245237.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/24337710627.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395df8d8812---zisezi.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/nemanavesinovofawawebufig.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/57840694186.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109011120387859.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gozifilituwokevawixefupas.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903122230194.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/vijafovenuz.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/fekavobitunexux.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/37416856480.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/parowosezobovurajofodujo.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pedunakimoxu.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/xokusukapesunuvusuferavot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fake+message+apk+downloadPDF 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_off0000b522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 16956 bytes
SHA-256: a469345ce522b4d997235d400b0e153a8f837c4f9b1060e8c9ae972dfde5ecba
font_01_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 10600 bytes
SHA-256: a6fba9d458e95b427f60ae55fda4699686d23d6494b2ef191859f12ce87e2bbd
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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