Malicious PDF — malware analysis report

Static analysis result for SHA-256 eada8e204ab0a5b4…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 12:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e54f039b678d68d0f6323cda3bfbf96 SHA-1: 14bb5f6e426117b100bd3546b9a53041e30e1d03 SHA-256: eada8e204ab0a5b4c85701e5f8e8b929c761c2f2ef8a0b6558fa32a6f138286c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/uplcv?utm_term=diff+prokaryotes+and+eukaryotes PDF link annotation
    • http://iccjsc.vn/images/uploads/files/36810511741.pdfIn PDF document text
    • https://bnovum.hu/downloads/32908052497.pdfIn PDF document text
    • http://apsons.eu/files/file/4257425867.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/68230735553.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/84091029991.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/46462579238.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kexubane.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e204a29218---dojowuxubiderul.pdfIn PDF document text
    • http://zaiger.ru/img/file/vobikizofonobekugan.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kajupijeno.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/91243321350.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/solezajefigajoxeminimofo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/vipelej.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/4299180569.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/86841575752.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/97853077503.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/38237936000.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/demepifebefoditalikamuf.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/21096278574.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9tod15bc15ci576n16pi1vob8l/xulevipepowoma.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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 10752 bytes
SHA-256: f980fa4c3f716926196cca3b5dafba7b5637adde248c0d39fc6879140c5d0f56
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16804 bytes
SHA-256: 68437c399c0b368ba37888f561824816836ee3a23054e40efa42513aaa73e50f
font_02_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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