Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0f201bdc411fd4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 10:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fff58feefe41d5cda8f55cf3778900c8 SHA-1: 9e2aab21a4dbbf682d081dd91ba3de34325d04f6 SHA-256: 1b0f201bdc411fd4bbfdc53226a0fad49a6c8828c0040a5c8a0a0cd9337e2214
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jottigo.ru/123?utm_term=kaththi+coin+fight+theme+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402032/normal_604467f46451a.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/dogagitove.pdfIn PDF document text
    • https://cdn.sqhk.co/fopajuxalaso/hhj20g5/99907920669.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/f46aabb.pdfIn PDF document text
    • http://ig-copyrightnotice.com/checklist_for_new_home_construction4za1x.pdfIn PDF document text
    • https://kozutimisomu.weebly.com/uploads/1/3/5/9/135982974/kuwexedufeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_604d674e772af.pdfIn PDF document text
    • https://rufevefiwavanu.weebly.com/uploads/1/3/5/9/135992343/d80a62d1da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_6052a1bf98512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_60024a603b96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6041b0607276e.pdfIn PDF document text
    • https://nufupegovofa.weebly.com/uploads/1/3/4/1/134131424/vufikip.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/23409666684xw3w9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_603f68fd78b32.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/dopuve.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/PeihihA/laxufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fef43940a709.pdfIn PDF document text
    • https://saredikov.weebly.com/uploads/1/3/0/8/130874194/48b7a51e4.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/segaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5136 bytes
SHA-256: 8145ff915a8d00c638d2f447189696d6d392bde0fe3ca84539d4fd21a4e681a2
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 11208 bytes
SHA-256: 7d173ed274b34c0173226f1d1d0ecc1f2d023eb05d7d5e99ec36cab8ba247e82

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