Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3508610e9800a72…

MALICIOUS

PDF

81.4 KB Created: 2021-03-30 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 657cadb8e0af3351a21b6a7ca6d740e9 SHA-1: accc91c2a45e5b8e02ed2f47db1172a6db52a090 SHA-256: c3508610e9800a72dc6527b88b49c2da1038199c7c2a5bc3752e461bee46d279
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to contain junk data, but the presence of numerous links suggests an attempt to direct users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=abjection+kristeva+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffd0b0731cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_5fe686fdb730d.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/what_is_abnormal_findings.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/kojubumixabixix.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/5a0b4b52c79250e.pdfIn PDF document text
    • https://zufojemesegogof.weebly.com/uploads/1/3/4/7/134753559/pupegalosepewezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_601b1e9661113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_606099ce41b7c.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/tomutezivuxofoporiw.pdfIn PDF document text
    • https://lerugusenexeke.weebly.com/uploads/1/3/5/3/135317851/a0d020f11b50.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/6452854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_604d2c61c884f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fdc11a837137.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/62290138454.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/7d3716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://samesesodore.onlinewebshop.net/85814319402.pdfIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/78625662375.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/jefivigitedemelubofelug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 5232 bytes
SHA-256: 5c956dc04a04f13cabad1ae13184c9565dfb69da39aa09814525f28aaeff9b52
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10648 bytes
SHA-256: ef5c78a53e056439cd009385fa6b4ea142986ebb01f0ac5ffba0f2d7da267c9b
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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