Malicious PDF — malware analysis report

Static analysis result for SHA-256 f960a2f5994f8c86…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 20:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8feec5b1469a0a9e019f7d011bff494 SHA-1: 9c2bc2ccee6f54eaa1cda36e57b074e5751a8f1a SHA-256: f960a2f5994f8c86c00cfee896bf4ef74cfcc79b8b5079100c63beba01eb6a90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded JavaScript and external links. The primary attack vector appears to be a malicious attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=active+voice+vs+passive+voice+checker PDF link annotation
    • https://drinkpoint.com/uploads/files/97137398704.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/31711633080.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/13975621671.pdfIn PDF document text
    • http://specimport.by/files/files/gupidegabokul.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501752d3426---43108711162.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/52705305198.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijumirujivod.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/pudimabubozokutog.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/26163157462.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/38592539020.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/35026695760.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210922172150.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44178387240.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mibasodorisupogowazanosen.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/31946581925.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/tejexerixosidef.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/tulujepamikumiluxuregul.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/68907033198.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xomamidafipo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434b95683fc---96651909654.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/27852189605.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kisawopewogofidi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24572052502.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_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 15384 bytes
SHA-256: eebe7b0606c3909aae83f9c19eb331660098b63212284825d322cbbe8823afab
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10460 bytes
SHA-256: f47c01c40cd20b6bc124126aa7e0935d6387fe8b384001375ab71280b1a3e92e

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