Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8089074b4acbce6…

MALICIOUS

PDF

70.6 KB Created: 2021-10-07 05:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80ad4c7242eb17846f36b93fef9b2ba5 SHA-1: c41ee389ff4f2f77f878ac7256615b46ed9a41c7 SHA-256: e8089074b4acbce62f2d8dcf488cd9c81291a488d51096e365c775017fb17f1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. ClamAV and an ML classifier identified it as malicious, likely a phishing or malware distribution vehicle. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=food+concessionaire+meaning PDF link annotation
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitob.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348e4756525---64705505344.pdfIn PDF document text
    • https://33mobility.net/uploads/files/35457150149.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/66718946745.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/xerikoposurofunon.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/deweburozavudis.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/82566272034.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/ziferibuzomalegeza.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/xukidosuri.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/84950433957.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/83654181620.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rimanapojigovigoniro.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/577346757.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/temuzosowawanoxozavezuvew.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pafuxemele.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/39200101770.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/jefewubo.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/92447375041.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5762a441---rexukitokonogowiziz.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/finokafesamijaposarerujep.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/87786935979.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_off0000b592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 10548 bytes
SHA-256: 61b9ddd263ceb5e81192fdf0b43932a705d372a72901434613df7a232dab5912
font_02_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 15532 bytes
SHA-256: 6c88d8b58a9263aa1611afc90f151950ba4042b1719b051eda3ea92d1ce25737

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