Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa7faf2ed9ea877…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 16:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f24ad6ba047c5ebfef3c2eec116bff2 SHA-1: 6934d1b48af83ec560e1ecde5c13b5661ce6983b SHA-256: baa7faf2ed9ea877fa376fc26fe4ec34bbab9475a0a628ffa048deefc9499bd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and malformed exploit streams. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://thietbibepnhahang.net/media/files/nupavukunemi.pdf In PDF document text
    • http://opusincertum.it/userfiles/files/82976303252.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vogeb.pdfIn PDF document text
    • http://come2menorca.com/images/file/wodadugamelodumedosupoda.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58795981811.pdfIn PDF document text
    • https://quizai.com/uploads/files/81928323656.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/drsa9uetl4t9m9bh8a9kvnghm6/zozigojarezuniru.pdfIn PDF document text
    • https://reniuved.it/file/13727179149.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614025d56d76d---kolikadomaz.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/9761863661.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/88961468875.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041210204159.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/45652687307.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pukoles.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/81354136367.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/11780756241.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/62213685063.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/81974029773.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210911063017333350.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/14268093262.pdfIn PDF document text
    • https://virker-ikke.dk/files/retobabiluzagijifomabowim.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/42855627340.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/92386663973.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/fepibijibejusojilan.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/37478814062.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/81208207231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=xiaomi+redmi+note+9+5g+antutuPDF 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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10788 bytes
SHA-256: d7a44dd4bb2134f26ae8216e3101f66b704e3aa4490031626f68aeb6f04752d8
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 19080 bytes
SHA-256: 27958a0ec5bdebb8fc44cdf41b627df463e672b933472d961f8e728ec783f386

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