Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9c05364f9b8b7f…

MALICIOUS

PDF

111.6 KB Created: 2021-03-01 06:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: feac30b6335939cb17dfccb3649130d6 SHA-1: e63129b79a3d1a1edc9d487e0071944b863ea32e SHA-256: 9e9c05364f9b8b7f7997c66380cd92f29c1a73679399f9c550c95ab1f7c4b004
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=forgotten+realms+wiki+red+dragon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446152/normal_602f031bb6338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_5fd36ca226daf.pdfIn PDF document text
    • https://ranezilipevag.weebly.com/uploads/1/3/5/3/135392607/kugojiwisemexotiwupu.pdfIn PDF document text
    • http://amaryllis.space/javascript_date_print_formatkamy1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022c9203a1c5.pdfIn PDF document text
    • http://poverkavoda.website/video_sites_freejzqr5.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/maths_workbook_for_class_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385204/normal_60040cb50d4ee.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/bosaredome.pdfIn PDF document text
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/5493505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_6016b59b22dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6015925e2a6ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvusere.epizy.com/relugonuzafigepobimo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001796e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796E 5256 bytes
SHA-256: a83d0c15de009a49ea2b5056a5b2ce7f3bd494357c72c1343d249e31ecb40b4f
font_01_sfnt_off00018b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4F 11104 bytes
SHA-256: 4944152af3fed0c952e66d8ba197405fff8e5885dafd1cf9afefd05633449c92