Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d941ea10477dd6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 06:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb8657c3fbe681d079f863180fbce747 SHA-1: 58e384e2c9a789e7c3f1570acc8fd90bf8c69af6 SHA-256: 88d941ea10477dd6df081342e92edba6ce9bd06ea9876ebc8f618e206c425c4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to obscure the true destination. One URL, http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/moviluvosubepasatumuse.pdf, is particularly suspicious as it is hosted on a domain that appears to be used for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/moviluvosubepasatumuse.pdf In PDF document text
    • http://hk-bbc.com/upload/file/83933179377.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/252f51e69699bbce88331fb18efdd8ee/62968107728.pdfIn PDF document text
    • http://ping-property.com/user_img/files/30250423125.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/viloludoru.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/gediroredogi.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/18264344021.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2ce9dda0a510a359e5353b1b37350ee0/pifewufusuradife.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/87619016624.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/36653628349.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/rasoxitatonesaj.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/napalitobijabip.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/30189628902.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/reveniril.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/memenexexominiriv.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/wafumizawinu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907505140.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/powajilujokerixaba.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/guxafonun.pdfIn PDF document text
    • http://prmakeup.com/Image/files/16878901195.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/39514070226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tiny+toon+game+apk+downloadPDF 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_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 10720 bytes
SHA-256: 463a221bd6e6c5250023bed1bfc93c09c2ccfa5400e562b6785da68999609c00
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 17720 bytes
SHA-256: 2d9b697ecf3afa7b0eb6a5f95f945763efa4f1774f03f3c28a6601a522d2000f
font_02_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1