Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b08d0bfe945f59…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 11:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f66b239b5b6148ed262d978e227fe88f SHA-1: 6808bbc0a803e9481ee83994552a678aca7d505d SHA-256: 11b08d0bfe945f59917e607e13e1c3cc289a2ea57946c90af4f59227a6e6165c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://maksimetall.ru/files/43627501338.pdf In PDF document text
    • http://vo23.ru/upload/file/vokeruwipitutozibokek.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/5978699386.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109020835354434.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/61573595411.pdfIn PDF document text
    • https://italvaping.com/file/13930152919.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/9747158702.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/27426304091.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/fifiv.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/33736415581.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/58440049293.pdfIn PDF document text
    • https://ikansambel.com/contents/files/34968007048.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/jubowowebepikerusud.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/81690022186.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/damikovozojebugexukawi.pdfIn PDF document text
    • https://keongracun.org/contents/files/80883829193.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaf43f29f---35228262147.pdfIn PDF document text
    • http://grimastone.ru/files/60162342144.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/1204274255.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/40958703574.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • https://mauspro.net/upload/files/43767817710.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/datikodilesawa.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/nesitimurutupuvetumikikod.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/69565398120.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pasotaniwetoxolagokes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=london+has+fallen+movie+onlinePDF 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10444 bytes
SHA-256: dcc7b48244e635a03019421df1f79ef799accf635b5170ced99b21ec8d6fa786
font_02_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 17344 bytes
SHA-256: dfae2b990acfa11c56537fe4d726b7f04721c1af620c0d6dd611c63340217e46