Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cdc4b95a45bd33…

MALICIOUS

PDF

85.9 KB Created: 2021-05-20 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 454dc5dc56545e667557f68d39a9946b SHA-1: e5ad3d4a0102fa44bf8baf406e3fcc7f86ce070b SHA-256: 43cdc4b95a45bd33ea9342f178d7e23a43b3f62e50116c03689fd5f8813fbc4a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+much+is+blackpink+lisa+worth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367627/normal_600262ba93931.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/3476269.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/9e6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_60542b0c623f5.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/4571762.pdfIn PDF document text
    • https://pagimoroxu.weebly.com/uploads/1/3/4/2/134265496/gusoreje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60387aa541a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fffcb0174113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488349/normal_60675d71bc3e6.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/3481750.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/binutapexiwud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_60207b9ac2d88.pdfIn PDF document text
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/d9f719c363e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_60167f2c8894b.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/zovesifutapolu.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/lobinunineru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_604623e08ed48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/how_to_have_difficult_conversations_training.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/90894437434.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/12033073170.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/java_windows_10_pro_64_bit.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_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 5428 bytes
SHA-256: 954b2fcc8862acab0400a7b8da21978d525072633d30c8db16d3a51ca869a9ca
font_01_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 11740 bytes
SHA-256: 1690859b3e5baac013e2fd8e0057d5183088cc9b9a29bf5667b704c0197e9993

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