Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c33baf64506812e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 00:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29f24b4de34ff7be15fd448f86024451 SHA-1: 2df7bc67d920e0d82175b54ac05b59d0b98c6b3e SHA-256: 1c33baf64506812e07711e4f8e6674043da7a0ac558cdb732f70ca86a577e064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=rang+punjab+full+movie+download+filmywap PDF link annotation
    • http://3e-machinery.ru/app/webroot/filesfiles/buziranojizapel.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210914_140443.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/vanukuzotadosu.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/murodajefubezeboso.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fae94a62---xarudefif.pdfIn PDF document text
    • https://luminex.pl/upload/file/22635685559.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/bupotapejafutiduvepugijur.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210921084847.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gefukadorina.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75354087399.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/031540274387.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210905_D00A39E18D511D66.pdfIn PDF document text
    • http://nature-revive.org/files/file/68868921338.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/20470903981.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/14011846270.pdfIn PDF document text
    • http://hak-al.com/resimler/files/30252266257.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/29556058773.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/28135605022.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/31922054993.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • http://cataga.de/beta/files/file/33749046508.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/tinerapididadibalaxa.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wemurovekutojirano.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210917211432.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_off0000b614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB614 11156 bytes
SHA-256: 5a6e9418d743c624a015efab0a47ef513634e9c505d8d0157d3d97c40df2bf20
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 17708 bytes
SHA-256: a327711ee4a5b92027b235b23da650284fb9f738cef68103862d6fa782c451b2
font_02_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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