Malicious PDF — malware analysis report

Static analysis result for SHA-256 1232c85cece29e35…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 11:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e94402011e09e13d7128f026bf40802 SHA-1: 77ef8c64dd9e9ef010529e9f9228be35dcbd2d38 SHA-256: 1232c85cece29e35c941bdff8c358cbdbe9988cbc134480a2cab3ae9e133c464
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0f6328c60b68ed15ea1dd53ddb4aa8a6/10684659540.pdf In PDF document text
    • http://oprandi.it/userfiles/files/7195821062.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/1156549316.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/60165290153.pdfIn PDF document text
    • http://rapet.hu/files/fagerepenof.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nutet.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/34047246885.pdfIn PDF document text
    • http://www.pilartangguh.com/file/vawisegivejupaxaleros.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/18982243191.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614633a8f0101---duradilovasolexiremebama.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/43278601698.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/puzivexuwuniwalusije.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zaledowoxolisogexara.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/16797251955.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zudebopakuladiru.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/52435503688.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/30158918583.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/80157397877.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/jebanomi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/wiluzupisakitoj.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/57385254780.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/58676424521.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vufifufafepoxixizozugiz.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/35758535189.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tuwulita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kimetsu+no+yaiba+mugen+train+layarkaca21PDF 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_off0000c345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC345 16964 bytes
SHA-256: dd6a09606697bb222b2e078bacdd9b13e7846b1e62dc0f4180853c6b68c48f2f
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 11180 bytes
SHA-256: 7baa42294034796adcf5ea274f62ac0499039a21d2ef9c6947dc8e1d7b4a8dad
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1