Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5506b12c62ac6ed…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 08:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3d8fc19156f7c6d90805c6483b40777 SHA-1: f85427b4197bbb77eb17bfc2ce618ead918463f7 SHA-256: e5506b12c62ac6edf437830991bd8ba193b4a043b50ab5c0c99fb04f2e2fcb78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=roehsoft+ram+expander+swap+apk+download PDF link annotation
    • https://cahayaapi1.com/contents/files/42794432647.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/87361784783.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/tonub.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614aec8db8ca6.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/girofavedepovudogotu.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/buwapizofujugafobosi.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/wuxukujajobotofokeruw.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/watadoti.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/55200390340.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109022134086162.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/52308834726.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/34091510552.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/naxivupipewawi.pdfIn PDF document text
    • http://oris-am.com/editor_up/15661800812.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/90234115719.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/30127313584.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e13132eda4215e0255c04d7a32d0116e/gunumabosuzidabozawet.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910030917.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lekufitadukegom.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/47167573610.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/zipido.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 10996 bytes
SHA-256: cfc408315402f0df9a86736a1d46fdea2d1f7929c0e7b65db4c2c5ea8cc466ca
font_02_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 18420 bytes
SHA-256: 57f9df7fd35ae1c1c0ac721da34fa6165ebe358df24868554eb28a085cae85f1

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