Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98aa49770c59aa6…

MALICIOUS

PDF

76.0 KB Created: 2021-06-05 01:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2f32afc3ff8ace0c7a3e1ef003068334 SHA-1: 08bac3372a95a964b7df637f5a48997b1169909e SHA-256: e98aa49770c59aa60b5d11e37fcc2014f394dfc7a73cacac82a0d650deb91f38
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links pointing to disposable domains, a common tactic for SEO manipulation or phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=black+theme+chrome+android PDF link annotation
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/06b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_6056861c298cd.pdfIn PDF document text
    • https://rojikejasixut.weebly.com/uploads/1/3/2/6/132682083/diwatut.pdfIn PDF document text
    • https://werovowota.weebly.com/uploads/1/3/4/7/134766705/zadofi.pdfIn PDF document text
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/4545950.pdfIn PDF document text
    • https://vurigejowuzebad.weebly.com/uploads/1/3/3/9/133997249/nopolizufodiko-ginuv-rasatupevutopo.pdfIn PDF document text
    • https://vubufixul.weebly.com/uploads/1/3/4/7/134708570/986a03f149.pdfIn PDF document text
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/pewijubif_gigadalupibudun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fce5de5e49f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_60214f0587230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_5fe1c6df08e73.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/7909311.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/ruwaliga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_6065e359296cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ff9097ee933f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_606e5c95828be.pdfIn PDF document text
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/2131392.pdfIn PDF document text
    • https://dajetulanew.weebly.com/uploads/1/3/4/3/134309067/6229152c09d.pdfIn PDF document text
    • https://mufikufit.weebly.com/uploads/1/3/4/7/134766202/tokofura_gatomaxemez_jabawosixamik_gezamate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f5e146-aaf2-48f2-8d85-b0c99960821e/43393933317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c8ff5f-065d-4889-8f82-0691e376bf87/nemereb.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_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 5116 bytes
SHA-256: 0a1fc43788ea5df4cca2576b9fc8f26ef8b0870f9b8607b0b195670efdd7f94d
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11276 bytes
SHA-256: c9342a6a96be1815e0ee6649cfe79a5c8c6d8829af741689cc37d52add183a52